diff --git a/mailer.py b/mailer.py
index c9834c6..b05d11e 100644
--- a/mailer.py
+++ b/mailer.py
@@ -286,12 +286,63 @@ def collect_report_data() -> dict:
         stats_24h = None
         samples_24h = []
 
+    # ── 按用户聚合 LD 板使用 ──
+    user_board_agg = []
+    try:
+        from app import DomainDetail
+        domain_rows = DomainDetail.query.filter_by(
+            snapshot_id=latest.id
+        ).all()
+        if domain_rows:
+            # 按用户聚合: 统计每用户用了多少块不同 LD
+            user_boards: dict[str, dict] = {}
+            for dr in domain_rows:
+                owner = dr.owner or ""
+                if not owner or owner.upper() in ("NONE", "UNOWNED", "FREE", "AVAILABLE"):
+                    continue
+                board_key = (dr.rack, dr.cluster, dr.ld_index)
+                if owner not in user_boards:
+                    user_boards[owner] = {
+                        "user": owner,
+                        "boards": set(),
+                        "racks": set(),
+                        "pods": set(),
+                        "designs": set(),
+                    }
+                entry = user_boards[owner]
+                entry["boards"].add(board_key)
+                if dr.rack is not None:
+                    entry["racks"].add(dr.rack)
+                t_pod = dr.t_pod or ""
+                # 过滤占位符 "--" (包括 "24 --" 这种含 -- 的)
+                if t_pod and "--" not in t_pod and t_pod.strip() != "":
+                    entry["pods"].add(t_pod)
+                design = dr.design or ""
+                if design:
+                    entry["designs"].add(design)
+
+            # 转为列表并排序 (按 LD 数降序)
+            for owner, info in user_boards.items():
+                boards_sorted = sorted(info["boards"], key=lambda x: (x[0], x[1], x[2]))
+                user_board_agg.append({
+                    "user": owner,
+                    "ld_count": len(boards_sorted),
+                    "boards": ", ".join(f"R{b[0]}C{b[1]}LD{b[2]}" for b in boards_sorted),
+                    "racks": ", ".join(str(r) for r in sorted(info["racks"])) if info["racks"] else "—",
+                    "pods": ", ".join(sorted(info["pods"])) if info["pods"] else "—",
+                    "designs": "; ".join(sorted(info["designs"])) if info["designs"] else "—",
+                })
+            user_board_agg.sort(key=lambda x: (-x["ld_count"], x["user"]))
+    except (ImportError, AttributeError):
+        pass
+
     return {
         "latest": latest,
         "boards_offline": boards_offline,
         "jobs_active": jobs_active,
         "stats_24h": stats_24h,
         "samples_24h": samples_24h,
+        "user_board_agg": user_board_agg,
         "now_utc": now,
         "now_local": datetime.now(),
     }
@@ -349,6 +400,20 @@ def _render_text(data: dict, base_url: str) -> str:
     lines.append(f"  活跃作业:    {latest.active_jobs}")
     lines.append("")
 
+    # 用户-LD 板统计
+    if data.get("user_board_agg"):
+        lines.append("【用户-LD 板统计】")
+        for ub in data["user_board_agg"]:
+            lines.append(f"  {ub['user']}:  {ub['ld_count']} 块 LD")
+            lines.append(f"    LD 板: {ub['boards']}")
+            if ub["racks"] != "—":
+                lines.append(f"    Rack: {ub['racks']}")
+            if ub["pods"] != "—":
+                lines.append(f"    T-Pod: {ub['pods']}")
+            if ub["designs"] != "—":
+                lines.append(f"    设计: {ub['designs']}")
+        lines.append("")
+
     # 24h 趋势
     if data["stats_24h"]:
         s = data["stats_24h"]
@@ -443,6 +508,32 @@ def _render_html(data: dict, base_url: str) -> str:
     else:
         jobs_html = '<p style="color:#888;margin:6px 0">无活跃作业</p>'
 
+    # 用户-LD 板统计 HTML
+    user_board_html = ""
+    if data.get("user_board_agg"):
+        ub_rows = "".join(
+            f'<tr style="border-bottom:1px solid #e9ecef">'
+            f'<td style="padding:6px 12px;font-family:monospace;font-weight:bold;color:#6f42c1">{ub["user"]}</td>'
+            f'<td style="padding:6px 12px;text-align:center"><span style="background:#6f42c1;color:#fff;padding:2px 8px;border-radius:10px;font-size:12px;font-weight:bold">{ub["ld_count"]}</span></td>'
+            f'<td style="padding:6px 12px;font-family:monospace;font-size:13px">{ub["racks"]}</td>'
+            f'<td style="padding:6px 12px;font-family:monospace;font-size:13px">{ub["pods"]}</td>'
+            f'<td style="padding:6px 12px;font-size:13px;color:#555">{ub["designs"]}</td>'
+            f'</tr>'
+            for ub in data["user_board_agg"]
+        )
+        user_board_html = f"""
+        <h2 style="font-size:16px;margin:20px 0 10px;color:#555">👤 用户-LD 板统计</h2>
+        <table style="border-collapse:collapse;width:100%;margin-top:6px">
+          <thead><tr style="background:#6f42c1;color:#fff">
+            <th style="padding:6px 12px;text-align:left">用户</th>
+            <th style="padding:6px 12px;text-align:center">LD 数</th>
+            <th style="padding:6px 12px;text-align:left">Rack</th>
+            <th style="padding:6px 12px;text-align:left">T-Pod</th>
+            <th style="padding:6px 12px;text-align:left">设计</th>
+          </tr></thead>
+          <tbody>{ub_rows}</tbody>
+        </table>"""
+
     # 24h 趋势 HTML
     if data["stats_24h"]:
         s = data["stats_24h"]
@@ -526,6 +617,9 @@ def _render_html(data: dict, base_url: str) -> str:
         </div>
       </div>
 
+      <!-- 用户-LD 板统计 -->
+      {user_board_html}
+
       <!-- 24h 趋势 -->
       <h2 style="font-size:16px;margin:20px 0 10px;color:#555">📈 近 24 小时趋势</h2>
       {trend_html}