diff --git a/src/memos/api/config.py b/src/memos/api/config.py
index 92df1ecf8..7ac882d6c 100644
--- a/src/memos/api/config.py
+++ b/src/memos/api/config.py
@@ -1,8 +1,16 @@
+import base64
+import hashlib
+import hmac
 import json
+import logging
 import os
+import re
+import time
 
 from typing import Any
 
+import requests
+
 from dotenv import load_dotenv
 
 from memos.configs.mem_cube import GeneralMemCubeConfig
@@ -13,6 +21,238 @@
 # Load environment variables
 load_dotenv()
 
+logger = logging.getLogger(__name__)
+
+
+def _update_env_from_dict(data: dict[str, Any]) -> None:
+    """Apply a dict to environment variables, with change logging."""
+
+    def _is_sensitive(name: str) -> bool:
+        n = name.upper()
+        return any(s in n for s in ["PASSWORD", "SECRET", "AK", "SK", "TOKEN", "KEY"])
+
+    for k, v in data.items():
+        if isinstance(v, dict):
+            new_val = json.dumps(v, ensure_ascii=False)
+        elif isinstance(v, bool):
+            new_val = "true" if v else "false"
+        elif v is None:
+            new_val = ""
+        else:
+            new_val = str(v)
+
+        old_val = os.environ.get(k)
+        os.environ[k] = new_val
+
+        try:
+            log_old = "***" if _is_sensitive(k) else (old_val if old_val is not None else "<unset>")
+            log_new = "***" if _is_sensitive(k) else new_val
+            if old_val != new_val:
+                logger.info(f"Nacos config update: {k}={log_new} (was {log_old})")
+        except Exception as e:
+            # Avoid logging failures blocking config updates
+            logger.debug(f"Skip logging change for {k}: {e}")
+
+
+def get_config_json(name: str, default: Any | None = None) -> Any:
+    """Read JSON object/array from env and parse. Returns default on missing/invalid."""
+    raw = os.getenv(name)
+    if not raw:
+        return default
+    try:
+        return json.loads(raw)
+    except Exception:
+        logger.warning(f"Invalid JSON in env '{name}', returning default.")
+        return default
+
+
+def get_config_value(path: str, default: Any | None = None) -> Any:
+    """Read value from env with optional dot-path for structured configs.
+
+    Examples:
+    - get_config_value("MONGODB_CONFIG.base_uri")
+    - get_config_value("MONGODB_BASE_URI")
+    """
+    if "." not in path:
+        val = os.getenv(path)
+        return val if val is not None else default
+    root, *subkeys = path.split(".")
+    data = get_config_json(root, default=None)
+    if not isinstance(data, dict):
+        return default
+    cur: Any = data
+    for key in subkeys:
+        if isinstance(cur, dict) and key in cur:
+            cur = cur[key]
+        else:
+            return default
+    return cur
+
+
+class NacosConfigManager:
+    _client = None
+    _data_id = None
+    _group = None
+    _enabled = False
+
+    # Pre-compile regex patterns for better performance
+    _KEY_VALUE_PATTERN = re.compile(r"^([^=]+)=(.*)$")
+    _INTEGER_PATTERN = re.compile(r"^[+-]?\d+$")
+    _FLOAT_PATTERN = re.compile(r"^[+-]?(\d+\.?\d*|\.\d+)([eE][+-]?\d+)?$")
+
+    @classmethod
+    def _sign(cls, secret_key: str, data: str) -> str:
+        """HMAC-SHA1 sgin"""
+        signature = hmac.new(secret_key.encode("utf-8"), data.encode("utf-8"), hashlib.sha1)
+        return base64.b64encode(signature.digest()).decode()
+
+    @staticmethod
+    def _parse_value(value: str) -> Any:
+        """Parse string value to appropriate Python type.
+
+        Supports: bool, int, float, and string.
+        """
+        if not value:
+            return value
+
+        val_lower = value.lower()
+
+        # Boolean
+        if val_lower in ("true", "false"):
+            return val_lower == "true"
+
+        # Integer
+        if NacosConfigManager._INTEGER_PATTERN.match(value):
+            try:
+                return int(value)
+            except (ValueError, OverflowError):
+                return value
+
+        # Float
+        if NacosConfigManager._FLOAT_PATTERN.match(value):
+            try:
+                return float(value)
+            except (ValueError, OverflowError):
+                return value
+
+        # Default to string
+        return value
+
+    @staticmethod
+    def parse_properties(content: str) -> dict[str, Any]:
+        """Parse properties file content to dictionary with type inference.
+
+        Supports:
+        - Comments (lines starting with #)
+        - Key-value pairs (KEY=VALUE)
+        - Type inference (bool, int, float, string)
+        """
+        data: dict[str, Any] = {}
+
+        for line in content.splitlines():
+            line = line.strip()
+
+            # Skip empty lines and comments
+            if not line or line.startswith("#"):
+                continue
+
+            # Parse key-value pair
+            match = NacosConfigManager._KEY_VALUE_PATTERN.match(line)
+            if match:
+                key = match.group(1).strip()
+                value = match.group(2).strip()
+                data[key] = NacosConfigManager._parse_value(value)
+
+        return data
+
+    @classmethod
+    def start_config_watch(cls):
+        while True:
+            cls.init()
+            time.sleep(60)
+
+    @classmethod
+    def start_watch_if_enabled(cls) -> None:
+        enable = os.getenv("NACOS_ENABLE_WATCH", "false").lower() == "true"
+        print("enable:", enable)
+        if not enable:
+            return
+        interval = int(os.getenv("NACOS_WATCH_INTERVAL", "60"))
+        import threading
+
+        def _loop() -> None:
+            while True:
+                try:
+                    cls.init()
+                except Exception as e:
+                    logger.error(f"❌ Nacos watch loop error: {e}")
+                time.sleep(interval)
+
+        threading.Thread(target=_loop, daemon=True).start()
+        logger.info(f"Nacos watch thread started (interval={interval}s).")
+
+    @classmethod
+    def init(cls) -> None:
+        server_addr = os.getenv("NACOS_SERVER_ADDR")
+        data_id = os.getenv("NACOS_DATA_ID")
+        group = os.getenv("NACOS_GROUP", "DEFAULT_GROUP")
+        namespace = os.getenv("NACOS_NAMESPACE", "")
+        ak = os.getenv("AK")
+        sk = os.getenv("SK")
+
+        if not (server_addr and data_id and ak and sk):
+            logger.warning("❌ missing NACOS_SERVER_ADDR / AK / SK / DATA_ID")
+            return
+
+        base_url = f"http://{server_addr}/nacos/v1/cs/configs"
+
+        def _auth_headers():
+            ts = str(int(time.time() * 1000))
+
+            sign_data = namespace + "+" + group + "+" + ts if namespace else group + "+" + ts
+            signature = cls._sign(sk, sign_data)
+            return {
+                "Spas-AccessKey": ak,
+                "Spas-Signature": signature,
+                "timeStamp": ts,
+            }
+
+        try:
+            params = {
+                "dataId": data_id,
+                "group": group,
+                "tenant": namespace,
+            }
+
+            headers = _auth_headers()
+            resp = requests.get(base_url, headers=headers, params=params, timeout=10)
+
+            if resp.status_code != 200:
+                logger.error(f"Nacos AK/SK fail: {resp.status_code} {resp.text}")
+                return
+
+            content = resp.text.strip()
+            if not content:
+                logger.warning("⚠️ Nacos is empty")
+                return
+            try:
+                data_props = cls.parse_properties(content)
+                logger.info("nacos config:", data_props)
+                _update_env_from_dict(data_props)
+                logger.info("✅ parse Nacos setting is Properties ")
+            except Exception as e:
+                logger.error(f"⚠️ Nacos parse fail（not JSON/YAML/Properties）: {e}")
+                raise Exception(f"Nacos configuration parsing failed: {e}") from e
+
+        except Exception as e:
+            logger.error(f"❌ Nacos AK/SK init fail: {e}")
+            raise Exception(f"❌ Nacos AK/SK init fail: {e}") from e
+
+
+# init Nacos
+NacosConfigManager.init()
+NacosConfigManager.start_watch_if_enabled()
+
 
 class APIConfig:
     """Centralized configuration management for MemOS APIs."""
diff --git a/src/memos/graph_dbs/polardb.py b/src/memos/graph_dbs/polardb.py
index 3f059e8ad..971a56e04 100644
--- a/src/memos/graph_dbs/polardb.py
+++ b/src/memos/graph_dbs/polardb.py
@@ -833,7 +833,6 @@ def get_nodes(
                 # Parse embedding from JSONB if it exists
                 if embedding_json is not None:
                     try:
-                        print("embedding_json:", embedding_json)
                         # remove embedding
                         """
                         embedding = json.loads(embedding_json) if isinstance(embedding_json, str) else embedding_json