diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a0f5c0436..41766c34df 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,12 @@ This section accumulates work toward the **2.3.0** milestone
 
 ### Fixed
 
+- **dev:** `scripts/dev_multi_instance.sh logs all` now prints the nginx logs
+  as well as both Gateway logs; it printed only the Gateway logs, the same as
+  `logs` with no argument. `logs nginx` and `logs all` also include `nginx.log`,
+  the nginx start command's own output, which no option printed before.
+  ([#7723])
+
 - **memory:** `GET /api/memory/config` and `/api/memory/status` now mask
   credential values in `backend_config` (`api_key`, tokens, passwords,
   `Authorization` headers, at any depth) as `***`. They returned the config as
@@ -15927,3 +15933,4 @@ with **180 merged pull requests** since the first 2.0 milestone tag.
 [#7651]: https://github.com/bytedance/deer-flow/pull/7651
 [#7659]: https://github.com/bytedance/deer-flow/pull/7659
 [#7665]: https://github.com/bytedance/deer-flow/pull/7665
+[#7723]: https://github.com/bytedance/deer-flow/pull/7723
diff --git a/CHANGELOG_zh.md b/CHANGELOG_zh.md
index 7f6d1fc9b1..a87009dbee 100644
--- a/CHANGELOG_zh.md
+++ b/CHANGELOG_zh.md
@@ -14,6 +14,11 @@
 
 ### 修复
 
+- **开发：** `scripts/dev_multi_instance.sh logs all` 现在除两个 Gateway 日志外也会输出
+  nginx 日志；此前它只输出 Gateway 日志，与不带参数的 `logs` 相同。`logs nginx` 与
+  `logs all` 还会包含 `nginx.log`（nginx 启动命令自身的输出），此前没有任何选项会输出它。
+  ([#7723])
+
 - **记忆：** `GET /api/memory/config` 与 `/api/memory/status` 现在会把 `backend_config`
   中的凭据值（`api_key`、token、密码、`Authorization` 请求头，任意层级）遮蔽为 `***`。
   此前它们按加载结果原样返回配置，而 `$VAR` 引用此时已被解析，因此 DeerMem 提取模型的密钥
@@ -12695,3 +12700,4 @@ DeerFlow 2.0 是围绕"超级智能体"框架的彻底重写，核心包含子
 [#7651]: https://github.com/bytedance/deer-flow/pull/7651
 [#7659]: https://github.com/bytedance/deer-flow/pull/7659
 [#7665]: https://github.com/bytedance/deer-flow/pull/7665
+[#7723]: https://github.com/bytedance/deer-flow/pull/7723
diff --git a/backend/docs/CONFIGURATION.md b/backend/docs/CONFIGURATION.md
index ffd724b1a5..8b885b4857 100644
--- a/backend/docs/CONFIGURATION.md
+++ b/backend/docs/CONFIGURATION.md
@@ -813,7 +813,7 @@ Notes:
 scripts/dev_multi_instance.sh up             # containers, config, Gateway A, then B, then nginx
 scripts/dev_multi_instance.sh check          # automated cross-instance checks (below)
 scripts/dev_multi_instance.sh stop b --kill  # SIGKILL B to simulate a crash; `start b` brings it back
-scripts/dev_multi_instance.sh logs a -f
+scripts/dev_multi_instance.sh logs a -f      # follow Gateway A; also b, nginx, or all (both Gateways and nginx)
 scripts/dev_multi_instance.sh down
 ```
 
diff --git a/backend/tests/test_dev_multi_instance_script.py b/backend/tests/test_dev_multi_instance_script.py
index 654ea7937c..d05666ce2f 100644
--- a/backend/tests/test_dev_multi_instance_script.py
+++ b/backend/tests/test_dev_multi_instance_script.py
@@ -607,6 +607,47 @@ def test_shell_script_rejects_unknown_commands(tmp_path):
     assert "Unknown command" in result.stderr
 
 
+_GATEWAY_LOGS = ("gateway-a.log", "gateway-b.log")
+_NGINX_LOGS = ("nginx.log", "nginx-error.log", "nginx-access.log")
+
+
+@pytest.mark.parametrize(
+    ("args", "expected"),
+    [((), _GATEWAY_LOGS), (("b",), ("gateway-b.log",)), (("nginx",), _NGINX_LOGS), (("all",), _GATEWAY_LOGS + _NGINX_LOGS)],
+    ids=["default", "b", "nginx", "all"],
+)
+def test_shell_script_logs_prints_the_selected_files(tmp_path, args, expected):
+    logs = tmp_path / "state" / "logs"
+    logs.mkdir(parents=True)
+    for name in _GATEWAY_LOGS + _NGINX_LOGS:
+        (logs / name).write_text(f"line from {name}\n", encoding="utf-8")
+    env = {**os.environ, "DEERFLOW_MI_STATE_DIR": str(tmp_path / "state")}
+
+    result = subprocess.run([require_script_bash(), str(SHELL_PATH), "logs", *args], capture_output=True, text=True, timeout=30, env=env)
+
+    assert result.returncode == 0, result.stderr
+    headers = [line.removeprefix("==> ").removesuffix(" <==") for line in result.stdout.splitlines() if line.startswith("==> ")]
+    assert [Path(header).name for header in headers] == list(expected)
+    for name in expected:
+        assert f"line from {name}" in result.stdout
+
+
+@pytest.mark.parametrize(("args", "expected"), [(("all",), _GATEWAY_LOGS), (("nginx",), ())], ids=["all", "nginx"])
+def test_shell_script_logs_skips_nginx_files_when_nginx_never_started(tmp_path, args, expected):
+    # start_nginx bails on a missing binary or busy port, leaving only Gateway logs.
+    logs = tmp_path / "state" / "logs"
+    logs.mkdir(parents=True)
+    for name in _GATEWAY_LOGS:
+        (logs / name).write_text(f"line from {name}\n", encoding="utf-8")
+    env = {**os.environ, "DEERFLOW_MI_STATE_DIR": str(tmp_path / "state")}
+
+    result = subprocess.run([require_script_bash(), str(SHELL_PATH), "logs", *args], capture_output=True, text=True, timeout=30, env=env)
+
+    assert result.returncode == 0, result.stderr
+    headers = [line.removeprefix("==> ").removesuffix(" <==") for line in result.stdout.splitlines() if line.startswith("==> ")]
+    assert [Path(header).name for header in headers] == list(expected)
+
+
 def test_makefile_exposes_harness_targets():
     makefile = (REPO_ROOT / "Makefile").read_text(encoding="utf-8")
 
diff --git a/scripts/dev_multi_instance.sh b/scripts/dev_multi_instance.sh
index 830679d8a6..91850f1cd6 100755
--- a/scripts/dev_multi_instance.sh
+++ b/scripts/dev_multi_instance.sh
@@ -59,7 +59,7 @@ Commands:
   up [--skip-install] [--no-nginx]  Start containers, render the config, start A, then B, then nginx
   down                              Stop everything; delete the containers and harness data (logs are kept)
   status                            Show containers, Gateways and nginx
-  logs [a|b|nginx|all] [-f]         Print the last 100 log lines (-f follows)
+  logs [a|b|nginx|all] [-f]         Print the last 100 log lines (default a and b; all adds nginx; -f follows)
   check [--with-llm]                Run the cross-instance checks against the running pair
   stop <a|b> [--kill]               Stop one Gateway (SIGTERM; --kill sends SIGKILL to simulate a crash)
   start <a|b>                       Start a stopped Gateway again
@@ -579,12 +579,13 @@ cmd_status() {
 }
 
 cmd_logs() {
-    local follow=false arg files=""
+    # nginx.log holds what the nginx command printed while starting.
+    local follow=false arg files="" nginx_logs="nginx.log nginx-error.log nginx-access.log"
     for arg in "$@"; do
         case "$arg" in
             a | b) files="$files gateway-$arg.log" ;;
-            nginx) files="$files nginx-error.log nginx-access.log" ;;
-            all) files="$files gateway-a.log gateway-b.log" ;;
+            nginx) files="$files $nginx_logs" ;;
+            all) files="$files gateway-a.log gateway-b.log $nginx_logs" ;;
             -f | --follow) follow=true ;;
             *) die "Unknown option for logs: $arg" ;;
         esac