diff --git a/saars/android-app/app/src/main/java/com/saars/chatplatform/presentation/agent/AgentChatActivity.java b/saars/android-app/app/src/main/java/com/saars/chatplatform/presentation/agent/AgentChatActivity.java
index d485970..8879614 100644
--- a/saars/android-app/app/src/main/java/com/saars/chatplatform/presentation/agent/AgentChatActivity.java
+++ b/saars/android-app/app/src/main/java/com/saars/chatplatform/presentation/agent/AgentChatActivity.java
@@ -4,6 +4,8 @@ import android.os.Bundle;
 import android.widget.Toast;
 
 import androidx.appcompat.app.AppCompatActivity;
+
+import org.json.JSONObject;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -97,18 +99,41 @@ public class AgentChatActivity extends AppCompatActivity {
                     appendBotMessage(reply);
                     scrollToBottom();
                 } else {
-                    Toast.makeText(AgentChatActivity.this, "请求失败: " + response.message(), Toast.LENGTH_SHORT).show();
+                    String errMsg = getErrorMessage(response);
+                    Toast.makeText(AgentChatActivity.this, errMsg, Toast.LENGTH_LONG).show();
                 }
             }
 
             @Override
             public void onFailure(Call<ApiService.AgentChatResponse> call, Throwable t) {
                 binding.btnSend.setEnabled(true);
-                Toast.makeText(AgentChatActivity.this, "请求失败: " + t.getMessage(), Toast.LENGTH_SHORT).show();
+                String msg = t.getMessage();
+                if (msg == null || msg.isEmpty()) msg = "网络异常";
+                Toast.makeText(AgentChatActivity.this, "知你客服暂不可用: " + msg, Toast.LENGTH_LONG).show();
             }
         });
     }
 
+    /** 从 502/503 等错误响应中解析后端返回的 error 文案 */
+    private String getErrorMessage(Response<ApiService.AgentChatResponse> response) {
+        try {
+            if (response.errorBody() != null) {
+                String body = response.errorBody().string();
+                if (!body.isEmpty()) {
+                    JSONObject jo = new JSONObject(body);
+                    if (jo.has("error")) {
+                        return jo.optString("error", "知你客服暂不可用，请稍后重试");
+                    }
+                }
+            }
+        } catch (Exception ignored) { }
+        int code = response.code();
+        if (code == 502 || code == 503) {
+            return "知你客服暂不可用，请稍后重试";
+        }
+        return "请求失败: " + response.message();
+    }
+
     private void appendUserMessage(String content) {
         ApiService.Message m = new ApiService.Message();
         m.id = "local_u_" + System.currentTimeMillis();
diff --git a/saars/backend/app/api/agent_proxy.py b/saars/backend/app/api/agent_proxy.py
index d970712..00c837d 100644
--- a/saars/backend/app/api/agent_proxy.py
+++ b/saars/backend/app/api/agent_proxy.py
@@ -30,5 +30,16 @@ def agent_chat():
     try:
         reply = chat_with_agent(base_url, username, password, agent_id, message, user_id)
         return jsonify({"reply": reply or ""})
+    except ValueError as e:
+        err = str(e)
+        if "401" in err or "登录失败" in err:
+            return jsonify({"error": err}), 503
+        return jsonify({"error": err}), 502
     except Exception as e:
-        return jsonify({"error": str(e)}), 502
+        err = str(e)
+        # 任何包含 401/Unauthorized 的异常都视为平台认证失败，返回友好提示
+        if "401" in err or "Unauthorized" in err:
+            return jsonify({
+                "error": "知你客服平台登录失败(401)，请确认 8037 服务已启动且 PLATFORM_USERNAME/PLATFORM_PASSWORD 正确"
+            }), 503
+        return jsonify({"error": err}), 502
diff --git a/saars/backend/app/config.py b/saars/backend/app/config.py
index 8677449..3d350d3 100644
--- a/saars/backend/app/config.py
+++ b/saars/backend/app/config.py
@@ -17,9 +17,9 @@ class Config:
     """Base config."""
     SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-change-in-production")
     SQLALCHEMY_TRACK_MODIFICATIONS = False
-    # 知你客服 Agent 代理（方式一）：低代码平台地址与对接账号（用户名 amind，密码 123456）
+    # 知你客服 Agent 代理：与 androidExampleDemo 一致，8037 使用 admin/123456
     PLATFORM_BASE_URL = os.getenv("PLATFORM_BASE_URL", "http://101.43.95.130:8037")
-    PLATFORM_USERNAME = os.getenv("PLATFORM_USERNAME", "amind")
+    PLATFORM_USERNAME = os.getenv("PLATFORM_USERNAME", "admin")
     PLATFORM_PASSWORD = os.getenv("PLATFORM_PASSWORD", "123456")
     PLATFORM_AGENT_ID = os.getenv("PLATFORM_AGENT_ID", "7332bba7-f9e7-4e10-9af6-7a0509a3ef97")
     JWT_ACCESS_TOKEN_EXPIRES = timedelta(hours=1)
diff --git a/saars/backend/app/services/agent_proxy.py b/saars/backend/app/services/agent_proxy.py
index 41e0195..84da686 100644
--- a/saars/backend/app/services/agent_proxy.py
+++ b/saars/backend/app/services/agent_proxy.py
@@ -21,12 +21,26 @@ def _get_platform_token(base_url, username, password):
         return _platform_token
     url = f"{base_url.rstrip('/')}/api/v1/auth/login"
     try:
+        # 8037 使用 form 登录；先 form，失败再试 JSON
         r = requests.post(
             url,
             data={"username": username, "password": password},
             headers={"Content-Type": "application/x-www-form-urlencoded"},
             timeout=10,
         )
+        if r.status_code == 422:
+            logger.warning("平台登录 form 返回 422，尝试 JSON: %s", r.text[:200] if r.text else "")
+            r = requests.post(
+                url,
+                json={"username": username, "password": password},
+                headers={"Content-Type": "application/json"},
+                timeout=10,
+            )
+        if r.status_code == 401:
+            logger.warning("平台登录仍 401，请检查 PLATFORM_USERNAME/PLATFORM_PASSWORD 及平台账号: %s", r.text[:200] if r.text else "")
+            raise ValueError(
+                "知你客服平台登录失败(401)，请确认 8037 服务已启动且 PLATFORM_USERNAME/PLATFORM_PASSWORD 正确"
+            )
         r.raise_for_status()
         data = r.json()
         token = data.get("access_token")
@@ -35,6 +49,15 @@ def _get_platform_token(base_url, username, password):
         _platform_token = token
         _token_expires_at = time.time() + 3600  # 假设 1 小时有效
         return token
+    except requests.exceptions.HTTPError as e:
+        if e.response is not None and e.response.status_code == 401:
+            raise ValueError(
+                "知你客服平台登录失败(401)，请确认 8037 服务已启动且账号配置正确"
+            )
+        logger.exception("平台登录失败: %s", e)
+        raise
+    except ValueError:
+        raise
     except Exception as e:
         logger.exception("平台登录失败: %s", e)
         raise
diff --git a/saars/backend/scripts/check_platform_login.sh b/saars/backend/scripts/check_platform_login.sh
new file mode 100644
index 0000000..4c602ca
--- /dev/null
+++ b/saars/backend/scripts/check_platform_login.sh
@@ -0,0 +1,67 @@
+#!/bin/bash
+# 检查 8037 平台是否可访问，以及登录接口是否可用
+# 用法: bash scripts/check_platform_login.sh
+# 或指定账号: PLATFORM_USERNAME=你的账号 PLATFORM_PASSWORD=你的密码 bash scripts/check_platform_login.sh
+
+BASE_URL="${PLATFORM_BASE_URL:-http://101.43.95.130:8037}"
+USER="${PLATFORM_USERNAME:-admin}"
+PASS="${PLATFORM_PASSWORD:-123456}"
+
+echo "=== 1. 检查 8037 是否可访问 ==="
+echo "GET $BASE_URL"
+if curl -s -o /dev/null -w "%{http_code}" --connect-timeout 5 "$BASE_URL" | grep -qE '^[23]'; then
+  echo "  可访问"
+else
+  echo "  无法访问或超时，请检查 8037 服务是否启动、防火墙/安全组是否放行"
+  exit 1
+fi
+
+echo ""
+echo "=== 2. 尝试登录（先 form，再 JSON） ==="
+
+# 先试 form（8037 可能只接受 form）
+echo "2a. POST form: username=$USER, password=***"
+RESP=$(curl -s -w "\n%{http_code}" -X POST "$BASE_URL/api/v1/auth/login" \
+  -H "Content-Type: application/x-www-form-urlencoded" \
+  -d "username=$USER&password=$PASS" \
+  --connect-timeout 10)
+HTTP_BODY=$(echo "$RESP" | head -n -1)
+HTTP_CODE=$(echo "$RESP" | tail -n 1)
+
+if [ "$HTTP_CODE" != "200" ] && [ "$HTTP_CODE" != "201" ]; then
+  echo "  form 状态: $HTTP_CODE, 响应: $HTTP_BODY"
+  echo "2b. POST JSON: {\"username\":\"$USER\",\"password\":\"***\"}"
+  RESP=$(curl -s -w "\n%{http_code}" -X POST "$BASE_URL/api/v1/auth/login" \
+    -H "Content-Type: application/json" \
+    -d "{\"username\":\"$USER\",\"password\":\"$PASS\"}" \
+    --connect-timeout 10)
+  HTTP_BODY=$(echo "$RESP" | head -n -1)
+  HTTP_CODE=$(echo "$RESP" | tail -n 1)
+fi
+
+if [ "$HTTP_CODE" = "200" ] || [ "$HTTP_CODE" = "201" ]; then
+  echo "  状态: $HTTP_CODE 成功"
+  if echo "$HTTP_BODY" | grep -q "access_token"; then
+    echo "  响应含 access_token，登录正常"
+  else
+    echo "  响应无 access_token，内容: $HTTP_BODY"
+  fi
+elif [ "$HTTP_CODE" = "401" ]; then
+  echo "  状态: 401 未授权"
+  echo "  响应: $HTTP_BODY"
+  echo "  -> 请确认 8037 上账号 $USER 的密码是否正确"
+  exit 1
+elif [ "$HTTP_CODE" = "422" ]; then
+  echo "  状态: 422 参数错误"
+  echo "  响应: $HTTP_BODY"
+  echo "  -> 8037 可能要求 form 或不同字段名，已尝试 form 与 JSON"
+  exit 1
+else
+  echo "  状态: $HTTP_CODE"
+  echo "  响应: $HTTP_BODY"
+  exit 1
+fi
+
+echo ""
+echo "=== 3. 若上面都成功，SAARS 后端应能正常代理知你客服 ==="
+echo "  重启后端: cd saars && docker compose restart backend"
diff --git a/saars/docker-compose.yml b/saars/docker-compose.yml
index c36e85c..e5c4373 100644
--- a/saars/docker-compose.yml
+++ b/saars/docker-compose.yml
@@ -10,9 +10,9 @@ services:
       PORT: "8052"
       DATABASE_URL: mysql+pymysql://root:!Rjb12191@gz-cynosdbmysql-grp-d26pzce5.sql.tencentcdb.com:24936/liaotian_db?charset=utf8mb4
       REDIS_URL: redis://redis:6379/0
-      # 知你客服 Agent 代理（方式一）：平台账号 amind/123456；Agent ID 需在平台 Agent 管理中点「知你客服」复制
+      # 知你客服 Agent 代理（与 androidExampleDemo 一致：admin/123456，8037 form 登录）
       PLATFORM_BASE_URL: http://101.43.95.130:8037
-      PLATFORM_USERNAME: amind
+      PLATFORM_USERNAME: admin
       PLATFORM_PASSWORD: "123456"
       PLATFORM_AGENT_ID: "7332bba7-f9e7-4e10-9af6-7a0509a3ef97"
     depends_on: