diff --git a/edc-web/app/models.py b/edc-web/app/models.py
index 511ebca..bb586bf 100644
--- a/edc-web/app/models.py
+++ b/edc-web/app/models.py
@@ -832,7 +832,8 @@ def delete_test_data(serial: str = "", date_from: str = "",
 # ─── tb_device_log ─────────────────────────────────────────────────
 
 def get_device_logs(page: int = 1, per_page: int = 30,
-                    serial: str = "", event_type: str = "") -> tuple[list[dict], int]:
+                    serial: str = "", event_type: str = "",
+                    date_from: str = "", date_to: str = "") -> tuple[list[dict], int]:
     """分页查询设备事件日志，返回 (records, total)"""
     conn = get_conn()
     try:
@@ -845,6 +846,12 @@ def get_device_logs(page: int = 1, per_page: int = 30,
             if event_type:
                 where.append("event_type = %s")
                 params.append(event_type)
+            if date_from:
+                where.append("create_time >= %s")
+                params.append(date_from if len(date_from) > 10 else date_from)
+            if date_to:
+                where.append("create_time <= %s")
+                params.append(date_to if len(date_to) > 10 else date_to + " 23:59:59")
 
             where_clause = " AND ".join(where) if where else "1=1"
 
@@ -865,6 +872,38 @@ def get_device_logs(page: int = 1, per_page: int = 30,
         conn.close()
 
 
+def export_device_logs(serial: str = "", event_type: str = "",
+                       date_from: str = "", date_to: str = "") -> list[dict]:
+    """导出全部设备事件日志（不分页）"""
+    conn = get_conn()
+    try:
+        with conn.cursor() as cur:
+            where = []
+            params = []
+            if serial:
+                where.append("device_serial LIKE %s")
+                params.append(f"%{serial}%")
+            if event_type:
+                where.append("event_type = %s")
+                params.append(event_type)
+            if date_from:
+                where.append("create_time >= %s")
+                params.append(date_from if len(date_from) > 10 else date_from)
+            if date_to:
+                where.append("create_time <= %s")
+                params.append(date_to if len(date_to) > 10 else date_to + " 23:59:59")
+
+            where_clause = " AND ".join(where) if where else "1=1"
+            cur.execute(
+                f"SELECT * FROM tb_device_log WHERE {where_clause} "
+                f"ORDER BY id DESC",
+                params,
+            )
+            return cur.fetchall()
+    finally:
+        conn.close()
+
+
 def delete_device_logs(serial: str = "", event_type: str = "",
                        date_from: str = "", date_to: str = "") -> int:
     """删除符合条件的设备日志，返回删除行数。至少需要一个条件。"""
diff --git a/edc-web/app/routes/device_logs.py b/edc-web/app/routes/device_logs.py
index 20b1f75..71a9c01 100644
--- a/edc-web/app/routes/device_logs.py
+++ b/edc-web/app/routes/device_logs.py
@@ -1,8 +1,11 @@
 """设备事件日志 API"""
 
-from flask import Blueprint, jsonify, render_template, request
+import csv
+import io
+
+from flask import Blueprint, jsonify, render_template, request, Response
 from flask_login import login_required, current_user
-from app.models import get_device_logs, delete_device_logs, insert_log
+from app.models import get_device_logs, export_device_logs, delete_device_logs, insert_log
 
 bp = Blueprint("device_logs", __name__)
 
@@ -22,15 +25,49 @@ def api_device_logs():
     per_page = request.args.get("per_page", 30, type=int)
     serial = request.args.get("serial", "", type=str)
     event_type = request.args.get("event_type", "", type=str)
+    date_from = request.args.get("date_from", "", type=str)
+    date_to = request.args.get("date_to", "", type=str)
 
     records, total = get_device_logs(
         page=page, per_page=per_page,
         serial=serial, event_type=event_type,
+        date_from=date_from, date_to=date_to,
     )
     pages = max(1, (total + per_page - 1) // per_page)
     return jsonify({"records": records, "total": total, "pages": pages})
 
 
+@bp.route("/api/device-logs/export")
+@login_required
+def api_export():
+    """导出设备事件日志为 CSV"""
+    serial = request.args.get("serial", "", type=str)
+    event_type = request.args.get("event_type", "", type=str)
+    date_from = request.args.get("date_from", "", type=str)
+    date_to = request.args.get("date_to", "", type=str)
+
+    records = export_device_logs(
+        serial=serial, event_type=event_type,
+        date_from=date_from, date_to=date_to,
+    )
+
+    output = io.StringIO()
+    writer = csv.writer(output)
+
+    if records:
+        headers = list(records[0].keys())
+        writer.writerow(headers)
+        for r in records:
+            writer.writerow(r.values())
+
+    output.seek(0)
+    return Response(
+        output.getvalue(),
+        mimetype="text/csv",
+        headers={"Content-Disposition": "attachment; filename=device_logs.csv"},
+    )
+
+
 @bp.route("/api/device-logs/delete", methods=["POST"])
 @login_required
 def api_device_logs_delete():
diff --git a/edc-web/app/templates/device_logs.html b/edc-web/app/templates/device_logs.html
index c651cf2..4686df3 100644
--- a/edc-web/app/templates/device_logs.html
+++ b/edc-web/app/templates/device_logs.html
@@ -17,7 +17,16 @@
             <option value="tcp_disconnect">TCP断开</option>
         </select>
     </label>
+    <label>
+        时间范围：
+        <input type="date" id="search-date-from">
+        <input type="time" id="search-time-from" step="1" style="width:110px;" title="起始时间（时:分:秒）">
+        至
+        <input type="date" id="search-date-to">
+        <input type="time" id="search-time-to" step="1" style="width:110px;" title="截止时间（时:分:秒）">
+    </label>
     <button onclick="searchLogs(1)" class="btn-search">查询</button>
+    <button onclick="exportCSV()" class="btn-export">导出 CSV</button>
     {% if current_user.role == 'admin' %}
     <button onclick="confirmDeleteLogs()" class="btn-delete">🗑 删除</button>
     {% endif %}
@@ -44,13 +53,25 @@
 <script>
 let currentPage = 1, totalPages = 1;
 
+function getDatetime(dateId, timeId) {
+    const d = document.getElementById(dateId).value;
+    const t = document.getElementById(timeId).value;
+    if (!d) return "";
+    if (!t) return d;                          // 纯日期 → 后端自动补时间
+    return d + " " + t;                        // 完整 datetime
+}
+
 async function searchLogs(page = 1) {
     currentPage = page;
     const serial = document.getElementById("search-serial").value;
     const event_type = document.getElementById("search-event").value;
+    const date_from = getDatetime("search-date-from", "search-time-from");
+    const date_to = getDatetime("search-date-to", "search-time-to");
     const params = new URLSearchParams({page, per_page: 30});
     if (serial) params.set("serial", serial);
     if (event_type) params.set("event_type", event_type);
+    if (date_from) params.set("date_from", date_from);
+    if (date_to) params.set("date_to", date_to);
 
     const resp = await fetch(`/api/device-logs?${params}`);
     const data = await resp.json();
@@ -120,20 +141,41 @@ function escHtml(s) {
     return String(s || '').replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
 }
 
+// ─── 导出 CSV ────────────────────────────────────
+
+function exportCSV() {
+    const serial = document.getElementById("search-serial").value;
+    const event_type = document.getElementById("search-event").value;
+    const date_from = getDatetime("search-date-from", "search-time-from");
+    const date_to = getDatetime("search-date-to", "search-time-to");
+    const params = new URLSearchParams();
+    if (serial) params.set("serial", serial);
+    if (event_type) params.set("event_type", event_type);
+    if (date_from) params.set("date_from", date_from);
+    if (date_to) params.set("date_to", date_to);
+
+    // 直接打开下载链接
+    window.location.href = `/api/device-logs/export?${params}`;
+}
+
+// ─── 删除 ────────────────────────────────────────
+
 async function confirmDeleteLogs() {
     const serial = document.getElementById("search-serial").value;
     const event_type = document.getElementById("search-event").value;
-    if (!serial && !event_type) {
-        alert("请至少输入设备序列号或选择事件类型作为删除条件");
+    const date_from = getDatetime("search-date-from", "search-time-from");
+    const date_to = getDatetime("search-date-to", "search-time-to");
+    if (!serial && !event_type && !date_from && !date_to) {
+        alert("请至少输入设备序列号、选择事件类型或指定时间范围作为删除条件");
         return;
     }
-    const msg = `确认删除设备日志？\n条件: serial=${serial || '(无)'} type=${event_type || '(无)'}\n此操作不可撤销！`;
+    const msg = `确认删除设备日志？\n条件: serial=${serial || '(无)'} type=${event_type || '(无)'} time=${date_from||'(无)'}~${date_to||'(无)'}\n此操作不可撤销！`;
     if (!confirm(msg)) return;
 
     const resp = await fetch("/api/device-logs/delete", {
         method: "POST",
         headers: {"Content-Type": "application/json"},
-        body: JSON.stringify({serial, event_type}),
+        body: JSON.stringify({serial, event_type, date_from, date_to}),
     });
     const data = await resp.json();
     if (data.ok) {