diff --git a/app/comments.js b/app/comments.js
index 94a6210..a0e99bc 100644
--- a/app/comments.js
+++ b/app/comments.js
@@ -55,28 +55,30 @@ export function saveFindings(workspace, findings, mirrorDir = null) {
 /**
  * 發布所有舊問題 comment（一次發布，依等級排序）
  */
-export async function postOldFindingsComment(findings) {
+export async function postOldFindingsComment(findings, deps = {}) {
+  const { postIssue = postComment } = deps;
   const old = findings.filter(f => !f.is_new);
   if (old.length === 0) {
     line('無舊問題，跳過');
     return;
   }
   const body = `## 📋 舊有未解決問題（${old.length} 筆）\n\n${buildTable(old)}`;
-  await postComment(body);
+  await postIssue(body);
   ok(`舊問題 comment 發布 (${old.length} 筆)`);
 }
 
 /**
  * 發布新問題中非 critical 的 comment（一次發布）
  */
-export async function postNewNonCriticalComment(findings) {
+export async function postNewNonCriticalComment(findings, deps = {}) {
+  const { postIssue = postComment } = deps;
   const items = findings.filter(f => f.is_new && f.level !== 'critical');
   if (items.length === 0) {
     line('無新的非嚴重問題，跳過');
     return;
   }
   const body = `## 🔍 新發現問題（${items.length} 筆）\n\n${buildTable(items)}`;
-  await postComment(body);
+  await postIssue(body);
   ok(`新問題（非嚴重）comment 發布 (${items.length} 筆)`);
 }
 
@@ -94,7 +96,7 @@ export async function postNewCriticalComments(findings, deps = {}) {
   }
   for (const f of criticals) {
     const loc = parseLocation(f.location);
-    if (loc) {
+    if (postInline && loc) {
       try {
         await postInline({ path: loc.file, line: loc.line, body: inlineCommentBody(f) });
         ok(`嚴重問題 行內 comment 發布: [${f.role}] ${loc.file}:${loc.line}`);
diff --git a/app/gitea.js b/app/gitea.js
index 7aeffed..76e7873 100644
--- a/app/gitea.js
+++ b/app/gitea.js
@@ -118,6 +118,15 @@ export async function postComment(body) {
   return resp.data;
 }
 
+export async function updateComment(commentId, body) {
+  const resp = await axios.patch(
+    api(`/repos/${GITEA_REPOSITORY}/issues/comments/${commentId}`),
+    { body },
+    { headers: headers(GITEA_COMMENT_TOKEN || GITEA_TOKEN), timeout: 30000, httpsAgent },
+  );
+  return resp.data;
+}
+
 /**
  * 在 PR 指定檔案的指定行數發布行內 review comment（標註程式碼位置）。
  * 透過 Gitea 的 pull reviews API，以 new_position 對應新版檔案的行號。
diff --git a/app/main.js b/app/main.js
index b793148..c7c0e80 100644
--- a/app/main.js
+++ b/app/main.js
@@ -1,7 +1,7 @@
 import path from 'path';
 import { GITEA_REPOSITORY, PR_NUMBER, PR_HEAD_BRANCH, PR_BASE_BRANCH, getLLMConfig, FINDINGS_PATH, EXCLUSIONS_PATH } from './config.js';
 import { loadRoles, getRoleIntro } from './roles.js';
-import { getPRDiff, postComment, getCommitMessageBySha, getBotReviewOutcome, shouldSkipBotCommit } from './gitea.js';
+import { getPRDiff, postComment, updateComment, getCommitMessageBySha, getBotReviewOutcome, shouldSkipBotCommit } from './gitea.js';
 import { analyzeWithRole, loadOldFindings, mergeFindings, sortByLevel, deduplicateWithAI, loadExclusions, applyExclusions, filterFalsePositivesWithAI } from './findings.js';
 import { saveFindings, postOldFindingsComment, postNewNonCriticalComment, postNewCriticalComments } from './comments.js';
 import { cloneRepo, commitAndPush, getRepoState } from './git.js';
@@ -63,9 +63,22 @@ async function main() {
     process.exit(0);
   }
 
+  let reviewComment = null;
+  let reviewCommentBody = getRoleIntro(roles) + `\n\n> 🔍 服務：${provider}  模型：${model}`;
+  const appendReviewComment = async (body) => {
+    if (!body) return null;
+    if (!reviewComment?.id) {
+      reviewCommentBody = body;
+      reviewComment = await postComment(reviewCommentBody);
+      return reviewComment;
+    }
+    reviewCommentBody += `\n\n---\n\n${body}`;
+    reviewComment = await updateComment(reviewComment.id, reviewCommentBody);
+    return reviewComment;
+  };
+
   try {
-    const intro = getRoleIntro(roles) + `\n\n> 🔍 服務：${provider}  模型：${model}`;
-    await postComment(intro);
+    reviewComment = await postComment(reviewCommentBody);
     ok('角色介紹 comment 發布成功');
   } catch (e) {
     warn(`comment 發布失敗（繼續執行）: ${e.message}`);
@@ -111,9 +124,9 @@ async function main() {
   const reviewDir = repoDir || WORKSPACE;
   saveFindings(WORKSPACE, filtered, reviewDir);
   try {
-    await postOldFindingsComment(filtered);
-    await postNewNonCriticalComment(filtered);
-    await postNewCriticalComments(filtered);
+    await postOldFindingsComment(filtered, { postIssue: appendReviewComment });
+    await postNewNonCriticalComment(filtered, { postIssue: appendReviewComment });
+    await postNewCriticalComments(filtered, { postInline: null, postIssue: appendReviewComment });
     ok('Step5 完成');
   } catch (e) {
     warn(`comment 發布失敗（繼續執行）: ${e.message}`);