diff --git a/app/comments.js b/app/comments.js
index c81b9ed..eb523e1 100644
--- a/app/comments.js
+++ b/app/comments.js
@@ -77,6 +77,13 @@ export function formatFindingsStats(findings) {
   ].join('\n');
 }
 
+export function formatFindingsStatsLine(findings) {
+  const oldFindings = findings.filter(f => f.is_new === false);
+  const newFindings = newFindingsOnly(findings);
+  const row = items => `嚴重${countBy(items, f => f.level === 'critical')} / 警告${countBy(items, f => f.level === 'warning')} / 建議${countBy(items, f => f.level === 'info')}`;
+  return `舊: ${row(oldFindings)}；新: ${row(newFindings)}`;
+}
+
 function buildReviewSummary(findings) {
   return [
     '## AI Code Review 統計',
@@ -111,10 +118,8 @@ export async function postFindingsReview(findings, deps = {}) {
   const body = buildReviewSummary(summaryFindings);
   await postReview({ body, comments });
   ok(`review 發布: summary=${summaryFindings.length} total=${sortedComments.length} commentable=${comments.length}`);
-  line('review summary 統計:');
-  for (const row of formatFindingsStats(summaryFindings).split('\n')) line(row);
-  line('review comments 統計:');
-  for (const row of formatFindingsStats(sortedComments).split('\n')) line(row);
+  line(`review summary 統計: ${formatFindingsStatsLine(summaryFindings)}`);
+  line(`review comments 統計: ${formatFindingsStatsLine(sortedComments)}`);
 }
 
 /**
diff --git a/app/comments.test.js b/app/comments.test.js
index 72da459..e8db471 100644
--- a/app/comments.test.js
+++ b/app/comments.test.js
@@ -3,7 +3,7 @@ import assert from 'node:assert/strict';
 import fs from 'node:fs';
 import os from 'node:os';
 import path from 'node:path';
-import { saveFindings, parseLocation, postNewCriticalComments, postFindingsReview, formatFindingsStats } from './comments.js';
+import { saveFindings, parseLocation, postNewCriticalComments, postFindingsReview, formatFindingsStats, formatFindingsStatsLine } from './comments.js';
 import { FINDINGS_PATH } from './config.js';
 
 describe('saveFindings', () => {
@@ -97,13 +97,15 @@ describe('parseLocation', () => {
 });
 
 describe('formatFindingsStats', () => {
+  const statsFindings = [
+    { level: 'critical', is_new: false },
+    { level: 'warning', is_new: true },
+    { level: 'info' },
+    { level: 'custom', is_new: true },
+  ];
+
   it('formats old and new findings by severity', () => {
-    const stats = formatFindingsStats([
-      { level: 'critical', is_new: false },
-      { level: 'warning', is_new: true },
-      { level: 'info' },
-      { level: 'custom', is_new: true },
-    ]);
+    const stats = formatFindingsStats(statsFindings);
 
     assert.equal(stats, [
       '| 類型 | 🔴 嚴重 | 🟡 警告 | 🔵 建議 |',
@@ -112,6 +114,13 @@ describe('formatFindingsStats', () => {
       '| 新問題 | 0 筆 | 1 筆 | 1 筆 |',
     ].join('\n'));
   });
+
+  it('formats compact one-line stats for action logs', () => {
+    assert.equal(
+      formatFindingsStatsLine(statsFindings),
+      '舊: 嚴重1 / 警告0 / 建議0；新: 嚴重0 / 警告1 / 建議1',
+    );
+  });
 });
 
 describe('postNewCriticalComments', () => {
diff --git a/app/main.js b/app/main.js
index 8316b54..156fdb2 100644
--- a/app/main.js
+++ b/app/main.js
@@ -3,7 +3,7 @@ import { GITEA_REPOSITORY, PR_NUMBER, PR_HEAD_BRANCH, PR_BASE_BRANCH, getLLMConf
 import { loadRoles, getRoleIntro } from './roles.js';
 import { getPRDiff, postComment, getCommitMessageBySha, getBotReviewOutcome, shouldSkipBotCommit } from './gitea.js';
 import { analyzeWithRole, loadOldFindings, mergeFindings, sortByLevel, deduplicateWithAI, loadExclusions, applyExclusions, filterFalsePositivesWithAI } from './findings.js';
-import { saveFindings, postFindingsReview, formatFindingsStats } from './comments.js';
+import { saveFindings, postFindingsReview, formatFindingsStatsLine } from './comments.js';
 import { cloneRepo, commitAndPush, getRepoState } from './git.js';
 import { validateJSONArrayFile, ensureJSONArrayFileExists } from './json.js';
 import { runPreflight } from './preflight.js';
@@ -12,8 +12,7 @@ import { section, step, line, ok, warn, error } from './log.js';
 const WORKSPACE = process.env.GITHUB_WORKSPACE || '/workspace';
 
 function logFindingsStats(label, findings) {
-  line(`${label}:`);
-  for (const row of formatFindingsStats(findings).split('\n')) line(row);
+  line(`${label}: ${formatFindingsStatsLine(findings)}`);
 }
 
 async function main() {