diff --git a/src/pages/QualityGate.tsx b/src/pages/QualityGate.tsx
index 1678749..7bc6410 100644
--- a/src/pages/QualityGate.tsx
+++ b/src/pages/QualityGate.tsx
@@ -31,22 +31,216 @@ type ChangedFile = {
   deletions: number;
 };
 
-type FileContent = {
-  content: string;
-  issues: Array<{
-    line: number;
-    severity: string;
-    message: string;
-    rule?: string;
-  }>;
+type FileContentIssue = {
+  line: number;
+  severity: string;
+  message: string;
+  rule?: string;
+  scanner?: string;
 };
 
+type FileContent = {
+  content: string;
+  issues: FileContentIssue[];
+};
+
+function normalizeFileContent(data: {
+  content?: string;
+  issues?: Array<{ line?: number; severity?: string; message?: string; description?: string; rule?: string; scanner?: string }>;
+  scan_issues?: Array<{ line?: number; severity?: string; message?: string; description?: string; rule?: string; scanner?: string }>;
+}): FileContent {
+  const raw = data.scan_issues ?? data.issues ?? [];
+  const issues: FileContentIssue[] = raw.map((iss) => {
+    const line = typeof iss.line === "number" ? iss.line : typeof iss.line === "string" ? parseInt(iss.line, 10) : 1;
+    return {
+      line: Number.isFinite(line) ? line : 1,
+      severity: String(iss.severity ?? "info").toLowerCase(),
+      message: String(iss.message ?? iss.description ?? ""),
+      rule: iss.rule,
+      scanner: iss.scanner,
+    };
+  });
+  return {
+    content: data.content ?? "",
+    issues,
+  };
+}
+
 type View = "dashboard" | "pr-list" | "settings";
 
+type PRHistoryItem = {
+  pr_number: number;
+  error_count?: number;
+  warning_count?: number;
+  total_issues?: number;
+};
+
 type QualityGateProps = {
   view: View;
 };
 
+const TREND_SLOTS = 15;
+const TREND_PX_PER_PR = 80;
+const TREND_CHART_HEIGHT = 220;
+
+function ProblemTrendChart({
+  history,
+  loading,
+}: {
+  history: PRHistoryItem[];
+  loading: boolean;
+}) {
+  if (loading) {
+    return (
+      <div className="rounded-2xl border border-border bg-white shadow-[0_6px_22px_rgba(0,0,0,0.04)] p-4">
+        <h3 className="text-base font-extrabold mb-3">问题趋势</h3>
+        <div className="text-center py-8 text-txt-muted text-sm">加载趋势数据中...</div>
+      </div>
+    );
+  }
+  if (!history || history.length === 0) {
+    return (
+      <div className="rounded-2xl border border-border bg-white shadow-[0_6px_22px_rgba(0,0,0,0.04)] p-4">
+        <h3 className="text-base font-extrabold mb-3">问题趋势</h3>
+        <div className="text-center py-8 text-txt-muted text-sm">暂无趋势数据</div>
+      </div>
+    );
+  }
+
+  const n = history.length;
+  const pad = Math.max(0, TREND_SLOTS - n);
+  const labels = history.map((p) => `#${p.pr_number}`).concat(Array(pad).fill(""));
+  const errorData: (number | null)[] = history.map((p) => p.error_count ?? 0).concat(Array(pad).fill(null));
+  const warningData: (number | null)[] = history.map((p) => p.warning_count ?? 0).concat(Array(pad).fill(null));
+
+  const width = TREND_SLOTS * TREND_PX_PER_PR;
+  const height = TREND_CHART_HEIGHT;
+  const padding = { top: 28, right: 24, bottom: 32, left: 40 };
+  const chartW = width - padding.left - padding.right;
+  const chartH = height - padding.top - padding.bottom;
+
+  const maxVal = Math.max(
+    1,
+    ...errorData.filter((v): v is number => v != null),
+    ...warningData.filter((v): v is number => v != null)
+  );
+  const yMax = Math.ceil(maxVal / 2) * 2 || 2;
+  const yTicks = Array.from({ length: yMax + 1 }, (_, i) => i);
+
+  const xScale = (i: number) => padding.left + (i / (labels.length - 1 || 1)) * chartW;
+  const yScale = (v: number) => padding.top + chartH - (v / yMax) * chartH;
+
+  const toPath = (data: (number | null)[]) => {
+    const parts: string[] = [];
+    for (let i = 0; i < data.length; i++) {
+      const v = data[i];
+      if (v == null) continue;
+      const x = xScale(i);
+      const y = yScale(v);
+      parts.push(parts.length === 0 ? `M ${x} ${y}` : `L ${x} ${y}`);
+    }
+    return parts.join(" ");
+  };
+
+  const toAreaPath = (data: (number | null)[]) => {
+    const points: { i: number; v: number }[] = [];
+    data.forEach((v, i) => {
+      if (v != null) points.push({ i, v });
+    });
+    if (points.length === 0) return "";
+    const linePath = points.map(({ i, v }) => `${i === 0 ? "M" : "L"} ${xScale(i)} ${yScale(v)}`).join(" ");
+    const lastX = xScale(points[points.length - 1].i);
+    const baseY = padding.top + chartH;
+    const startX = xScale(points[0].i);
+    return `${linePath} L ${lastX} ${baseY} L ${startX} ${baseY} Z`;
+  };
+
+  const errorPath = toPath(errorData);
+  const warningPath = toPath(warningData);
+  const errorAreaPath = toAreaPath(errorData);
+  const warningAreaPath = toAreaPath(warningData);
+
+  return (
+    <div className="rounded-2xl border border-border bg-white shadow-[0_6px_22px_rgba(0,0,0,0.04)] p-4">
+      <h3 className="text-base font-extrabold mb-3">问题趋势</h3>
+      <div className="overflow-x-auto overflow-y-hidden" style={{ maxWidth: "100%" }}>
+        <div style={{ width, minWidth: width, height }}>
+          <svg width={width} height={height} className="overflow-visible">
+            {/* 网格线 */}
+            {yTicks.map((tick, i) => (
+              <line
+                key={i}
+                x1={padding.left}
+                y1={yScale(tick)}
+                x2={padding.left + chartW}
+                y2={yScale(tick)}
+                stroke="rgba(0,0,0,0.12)"
+                strokeWidth={1}
+                strokeDasharray="4 4"
+              />
+            ))}
+            {labels.map((_, i) => (
+              <line
+                key={i}
+                x1={xScale(i)}
+                y1={padding.top}
+                x2={xScale(i)}
+                y2={padding.top + chartH}
+                stroke="rgba(0,0,0,0.12)"
+                strokeWidth={1}
+                strokeDasharray="4 4"
+              />
+            ))}
+            {/* 图例 */}
+            <g transform={`translate(${padding.left}, 8)`}>
+              <rect x={0} y={2} width={14} height={10} fill="#dc3545" rx={1} />
+              <text x={18} y={11} fontSize={11} fill="currentColor" className="text-txt">
+                错误
+              </text>
+              <rect x={70} y={2} width={14} height={10} fill="#ffc107" rx={1} />
+              <text x={88} y={11} fontSize={11} fill="currentColor" className="text-txt">
+                警告
+              </text>
+            </g>
+            {/* 面积填充 */}
+            <path d={errorAreaPath} fill="rgba(220, 53, 69, 0.1)" />
+            <path d={warningAreaPath} fill="rgba(255, 193, 7, 0.1)" />
+            {/* 折线 */}
+            <path d={errorPath} fill="none" stroke="#dc3545" strokeWidth={2} strokeLinecap="round" strokeLinejoin="round" />
+            <path d={warningPath} fill="none" stroke="#ffc107" strokeWidth={2} strokeLinecap="round" strokeLinejoin="round" />
+            {/* Y 轴刻度 */}
+            {yTicks.map((tick) => (
+              <text
+                key={tick}
+                x={padding.left - 8}
+                y={yScale(tick) + 4}
+                textAnchor="end"
+                fontSize={10}
+                fill="var(--color-txt-muted, #666)"
+              >
+                {tick}
+              </text>
+            ))}
+            {/* X 轴刻度 */}
+            {labels.map((label, i) => (
+              <text
+                key={i}
+                x={xScale(i)}
+                y={height - 8}
+                textAnchor="middle"
+                fontSize={10}
+                fill={label ? "var(--color-txt-muted, #666)" : "transparent"}
+              >
+                {label || "#"}
+              </text>
+            ))}
+          </svg>
+        </div>
+      </div>
+    </div>
+  );
+}
+
 const BASE = API.quality;
 
 async function apiGet<T>(path: string): Promise<T> {
@@ -73,6 +267,9 @@ export default function QualityGate({ view }: QualityGateProps) {
   const [fileContent, setFileContent] = useState<FileContent | null>(null);
   const [modalOpen, setModalOpen] = useState(false);
 
+  const [trendHistory, setTrendHistory] = useState<PRHistoryItem[]>([]);
+  const [trendLoading, setTrendLoading] = useState(false);
+
   const fetchPRs = useCallback(async () => {
     setLoading(true);
     setError("");
@@ -91,6 +288,23 @@ export default function QualityGate({ view }: QualityGateProps) {
     fetchPRs();
   }, [fetchPRs]);
 
+  const fetchTrendHistory = useCallback(async () => {
+    setTrendLoading(true);
+    try {
+      const data = await apiGet<PRHistoryItem[] | { history?: PRHistoryItem[] }>("/prs/history?limit=15");
+      const list = Array.isArray(data) ? data : data.history ?? [];
+      setTrendHistory(list);
+    } catch {
+      setTrendHistory([]);
+    } finally {
+      setTrendLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    if (view === "dashboard") fetchTrendHistory();
+  }, [view, fetchTrendHistory]);
+
   const openPRDetail = useCallback(async (prId: number) => {
     setLoading(true);
     setError("");
@@ -116,8 +330,8 @@ export default function QualityGate({ view }: QualityGateProps) {
   useEffect(() => {
     if (!modalOpen || !selectedPR || !selectedFile) return;
     setFileContent(null);
-    apiGet<FileContent>(`/prs/${selectedPR.id}/file?path=${encodeURIComponent(selectedFile)}`)
-      .then(setFileContent)
+    apiGet<Parameters<typeof normalizeFileContent>[0]>(`/prs/${selectedPR.id}/file?path=${encodeURIComponent(selectedFile)}`)
+      .then((data) => setFileContent(normalizeFileContent(data)))
       .catch(() => setFileContent({ content: "// Failed to load file", issues: [] }));
   }, [modalOpen, selectedPR, selectedFile]);
 
@@ -183,6 +397,10 @@ export default function QualityGate({ view }: QualityGateProps) {
             ))}
           </div>
 
+          <div className="mt-8 mb-8">
+            <ProblemTrendChart history={trendHistory} loading={trendLoading} />
+          </div>
+
           <h3 className="text-lg font-extrabold mb-4">Recent Pull Requests</h3>
           <PRTable prs={prs.slice(0, 8)} loading={loading} onView={(pr) => openPRDetail(pr.id)} />
         </>
@@ -281,53 +499,84 @@ export default function QualityGate({ view }: QualityGateProps) {
                 ))}
               </div>
 
-              <div className="flex-1 overflow-auto bg-white">
-                {fileContent ? (
-                  <pre className="text-sm font-mono leading-6 p-4">
-                    {fileContent.content.split("\n").map((line, i) => {
-                      const lineNum = i + 1;
-                      const issues = fileContent.issues.filter((iss) => iss.line === lineNum);
-                      return (
-                        <div key={i} className={`flex ${issues.length > 0 ? "bg-red-50/80" : ""}`}>
-                          <span className="w-12 shrink-0 text-right pr-4 text-txt-muted select-none text-xs leading-6">
-                            {lineNum}
-                          </span>
-                          <span className="flex-1 whitespace-pre-wrap">{line}</span>
-                          {issues.length > 0 && (
-                            <span className="shrink-0 px-2 text-xs text-red-600 max-w-xs truncate" title={issues[0].message}>
-                              ● {issues[0].message}
-                            </span>
-                          )}
-                        </div>
-                      );
-                    })}
-                  </pre>
-                ) : (
-                  <div className="flex items-center justify-center h-full text-txt-muted text-sm">
-                    {selectedFile ? "Loading file..." : "Select a file to inspect"}
-                  </div>
-                )}
-              </div>
-
-              <div className="w-[220px] shrink-0 border-l border-border overflow-y-auto p-4 bg-surface-muted/60">
-                <h3 className="text-xs font-bold text-txt-muted uppercase mb-3">Issue Panel</h3>
-                {fileContent?.issues.length === 0 && (
-                  <p className="text-xs text-txt-muted">No issues</p>
-                )}
-                {fileContent?.issues.map((iss, i) => (
-                  <div key={i} className="mb-3 p-2 bg-white border border-border text-xs rounded-lg">
-                    <div className="flex items-center gap-1 mb-1">
-                      <span className={`font-bold ${
-                        iss.severity === "error" ? "text-red-600" : iss.severity === "warning" ? "text-yellow-600" : "text-blue-600"
-                      }`}>
-                        {iss.severity === "error" ? "❌" : iss.severity === "warning" ? "⚠️" : "ℹ️"}
-                      </span>
-                      <span className="text-txt-muted">L{iss.line}</span>
+              {/* 代码区：完整代码 + 每行右侧缺陷标注，一行一个滚动条（参考 index copy.html） */}
+              <div className="flex-1 min-h-0 min-w-0 flex flex-col overflow-hidden">
+                <div className="flex-1 min-h-0 overflow-auto bg-[#1e1e1e] font-mono text-[13px] leading-[1.5]">
+                  {fileContent ? (
+                    <div className="min-w-min">
+                      {(fileContent.content ?? "").split("\n").map((line, i) => {
+                        const lineNum = i + 1;
+                        const lineIssues = (fileContent.issues ?? []).filter((iss) => iss.line === lineNum);
+                        const hasIssue = lineIssues.length > 0;
+                        const reasonText = hasIssue
+                          ? lineIssues.map((iss) => (iss.scanner ? `[${iss.scanner}] ` : "") + (iss.message || "")).join("；")
+                          : "";
+                        const displayText = line === "" ? "\u00A0" : line;
+                        return (
+                          <div
+                            key={i}
+                            className={`flex min-h-[1.5em] items-stretch ${hasIssue ? "code-line-has-issue" : ""}`}
+                          >
+                            {/* 行号区 */}
+                            <div className="w-12 min-w-[48px] shrink-0 flex items-center justify-end pr-2 text-[#6c757d] bg-[#252526] select-none">
+                              <span className="mr-1">{lineNum}</span>
+                              {hasIssue && (
+                                <span
+                                  className={
+                                    lineIssues[0]?.severity === "error" || lineIssues[0]?.severity === "high"
+                                      ? "text-[#f14c4c]"
+                                      : "text-[#cca700]"
+                                  }
+                                  title={reasonText}
+                                >
+                                  ●
+                                </span>
+                              )}
+                            </div>
+                            {/* 代码内容 */}
+                            <div
+                              className={`flex-1 min-w-0 px-3 py-0 whitespace-pre-wrap break-all text-[#d4d4d4] ${
+                                hasIssue ? "bg-red-900/20 border-l-2 border-l-red-500 pl-2" : ""
+                              }`}
+                            >
+                              {displayText}
+                            </div>
+                            {/* 虚线连接区 */}
+                            <div className="w-5 min-w-[20px] shrink-0 bg-[#1e1e1e] relative">
+                              {hasIssue && (
+                                <span
+                                  className="absolute left-0 right-0 top-1/2 -mt-px block border-b border-dashed border-red-500/80"
+                                  aria-hidden
+                                />
+                              )}
+                            </div>
+                            {/* 缺陷标注（与该行对齐，在右侧） */}
+                            <div
+                              className={`w-[180px] min-w-[180px] shrink-0 py-1.5 px-2 text-[11px] border-l flex items-center ${
+                                hasIssue
+                                  ? "bg-red-50/90 border-l-2 border-l-red-500 text-red-800"
+                                  : "bg-[#252526] border-[#3c3c3c] text-[#9d9d9d]"
+                              }`}
+                            >
+                              {hasIssue && reasonText ? (
+                                <>
+                                  <span className="text-red-500 mr-1.5 shrink-0">⚠</span>
+                                  <span className="break-words leading-snug">{reasonText}</span>
+                                </>
+                              ) : (
+                                <span className="invisible">-</span>
+                              )}
+                            </div>
+                          </div>
+                        );
+                      })}
                     </div>
-                    <p className="text-txt">{iss.message}</p>
-                    {iss.rule && <p className="text-txt-muted mt-0.5">{iss.rule}</p>}
-                  </div>
-                ))}
+                  ) : (
+                    <div className="flex items-center justify-center h-full min-h-[200px] text-[#6c757d] text-sm">
+                      {selectedFile ? "Loading file..." : "Select a file to inspect"}
+                    </div>
+                  )}
+                </div>
               </div>
             </div>