diff --git a/vscode/src/gitea/api.ts b/vscode/src/gitea/api.ts
index 4c5360a..2b7bb9b 100644
--- a/vscode/src/gitea/api.ts
+++ b/vscode/src/gitea/api.ts
@@ -29,6 +29,8 @@ export interface GiteaIssue {
   comments: number
   created_at: string
   updated_at: string
+  /** 工单关闭时间（ISO 8601）；未关闭为 null。完成列缺 PR 合并时间时用它排序。 */
+  closed_at?: string | null
   body: string
   html_url: string
   user: { login: string, avatar_url?: string } | null
diff --git a/vscode/src/gitea/issueLoader.ts b/vscode/src/gitea/issueLoader.ts
index 4e24852..45a1a89 100644
--- a/vscode/src/gitea/issueLoader.ts
+++ b/vscode/src/gitea/issueLoader.ts
@@ -435,6 +435,7 @@ async function buildIssue(opts: {
     ...(pr ? { pr } : {}),
     ...(prMerged !== undefined ? { prMerged } : {}),
     ...(mergedAt ? { prMergedAt: mergedAt } : {}),
+    ...(issue.closed_at ? { closedAt: issue.closed_at } : {}),
     ...(branch ? { branch } : {}),
     ...(worktreePath ? { worktreePath } : {}),
     ...(worktreeExists !== undefined ? { worktreeExists } : {}),
diff --git a/vscode/src/gitea/types.ts b/vscode/src/gitea/types.ts
index beb214b..45ebea6 100644
--- a/vscode/src/gitea/types.ts
+++ b/vscode/src/gitea/types.ts
@@ -76,6 +76,8 @@ export interface Issue {
   prMerged?: boolean
   /** PR 合并时间（ISO 8601，来自 PR API 的 merged_at）。完成列按它降序排序，未合并为 undefined。合并时持久化进 state JSON；完成工单加载时不再实时拉 PR，直接读持久化值（缺失则按工单号回退排序）。 */
   prMergedAt?: string
+  /** 工单关闭时间（ISO 8601，来自 Gitea issue 的 closed_at）。完成列缺 prMergedAt 时按它排序，直接关掉、没走 PR 的工单才不会沉底。 */
+  closedAt?: string
   /** Branch name created for implementation, e.g. `feature/<hash>`. */
   branch?: string
   /** Workspace-relative path to the implementation worktree. */
diff --git a/vscode/webview-ui/src/lib/issueSort.test.ts b/vscode/webview-ui/src/lib/issueSort.test.ts
new file mode 100644
index 0000000..df897f4
--- /dev/null
+++ b/vscode/webview-ui/src/lib/issueSort.test.ts
@@ -0,0 +1,56 @@
+import type { Issue, IssueColumn } from '../types'
+import { describe, expect, it } from 'vitest'
+import { compareIssuesInColumn } from './issueSort'
+
+function issue(
+  number: number,
+  column: IssueColumn,
+  extra: Partial<Issue> = {},
+): Issue {
+  return {
+    id: `repo#${number}`,
+    number,
+    title: `issue ${number}`,
+    column,
+    htmlUrl: '',
+    ...extra,
+  }
+}
+
+function sorted(col: IssueColumn, issues: Issue[]): number[] {
+  return [...issues].sort((a, b) => compareIssuesInColumn(col, a, b)).map(i => i.number)
+}
+
+describe('compareIssuesInColumn', () => {
+  it('非完成列按工单号降序', () => {
+    const list = [issue(10, 'todo'), issue(42, 'todo'), issue(7, 'todo')]
+    expect(sorted('todo', list)).toEqual([42, 10, 7])
+  })
+
+  it('完成列按 PR 合并时间降序', () => {
+    const list = [
+      issue(1, 'done', { prMergedAt: '2026-09-01T00:00:00Z' }),
+      issue(2, 'done', { prMergedAt: '2026-09-20T00:00:00Z' }),
+      issue(3, 'done', { prMergedAt: '2026-09-10T00:00:00Z' }),
+    ]
+    expect(sorted('done', list)).toEqual([2, 3, 1])
+  })
+
+  it('没有 PR 的完成工单用关闭时间参与同一条时间线，不沉底', () => {
+    const list = [
+      issue(100, 'done', { prMergedAt: '2026-09-01T00:00:00Z' }),
+      issue(427, 'done', { closedAt: '2026-09-20T12:00:00Z' }),
+      issue(300, 'done', { prMergedAt: '2026-09-10T00:00:00Z' }),
+    ]
+    expect(sorted('done', list)).toEqual([427, 300, 100])
+  })
+
+  it('两个时间都缺的排在最后，按工单号降序', () => {
+    const list = [
+      issue(5, 'done'),
+      issue(9, 'done'),
+      issue(1, 'done', { closedAt: '2026-01-01T00:00:00Z' }),
+    ]
+    expect(sorted('done', list)).toEqual([1, 9, 5])
+  })
+})
diff --git a/vscode/webview-ui/src/lib/issueSort.ts b/vscode/webview-ui/src/lib/issueSort.ts
index 3b7a95d..33ba083 100644
--- a/vscode/webview-ui/src/lib/issueSort.ts
+++ b/vscode/webview-ui/src/lib/issueSort.ts
@@ -3,13 +3,19 @@ import type { Issue, IssueColumn } from '../types'
 /**
  * 看板每一列的卡片排序。
  *
- * `done` 列按 PR 合并时间（merged_at）降序，最近合并的在最前；缺合并时间的
- * 工单排在有时间的之后，按工单号降序兜底。其余列一律按工单号降序。
+ * `done` 列按"完成时间"降序，最近完成的在最前。完成时间取 PR 合并时间
+ * （merged_at），没有 PR 的工单退回工单关闭时间（closed_at）——不这样兜底，
+ * 直接关掉、没走 PR 流程的工单会永远沉在列底看不见。两者都没有的排最后，
+ * 按工单号降序。其余列一律按工单号降序。
  */
+function doneAt(issue: Issue): string | undefined {
+  return issue.prMergedAt ?? issue.closedAt
+}
+
 export function compareIssuesInColumn(col: IssueColumn, a: Issue, b: Issue): number {
   if (col === 'done') {
-    const am = a.prMergedAt
-    const bm = b.prMergedAt
+    const am = doneAt(a)
+    const bm = doneAt(b)
     if (am && bm && am !== bm)
       return bm.localeCompare(am)
     if (am && !bm)
diff --git a/vscode/webview-ui/src/types.ts b/vscode/webview-ui/src/types.ts
index b90e226..0caecd0 100644
--- a/vscode/webview-ui/src/types.ts
+++ b/vscode/webview-ui/src/types.ts
@@ -53,6 +53,8 @@ export interface Issue {
   prMerged?: boolean
   /** PR 合并时间（ISO 8601，来自 merged_at）。完成列按它降序排序，未合并/查询失败为 undefined。不持久化进 state JSON。 */
   prMergedAt?: string
+  /** 工单关闭时间（ISO 8601）。完成列缺 prMergedAt 时按它排序。 */
+  closedAt?: string
   /** Branch name created for implementation, e.g. `feature/<hash>`. */
   branch?: string
   /** Workspace-relative path to the implementation worktree. */