diff --git a/visualdl/server/data_manager.py b/visualdl/server/data_manager.py
index 83ee8a0c02976edc5cccaca400e72a8fcf23f220..f1645ec846c944fb725dcb5d383d2efc60648270 100644
--- a/visualdl/server/data_manager.py
+++ b/visualdl/server/data_manager.py
@@ -16,17 +16,33 @@
 from __future__ import absolute_import
 import threading
 import random
+import json
 import collections
 
-DEFAULT_PLUGIN_MAXSIZE = {
-    "scalar": 1000,
-    "image": 10,
-    "histogram": 100,
-    "embeddings": 50000,
-    "audio": 10,
-    "pr_curve": 300,
-    "meta_data": 100
-}
+from visualdl.utils.dir import CONFIG_PATH
+
+try:
+    with open(CONFIG_PATH, 'r', encoding='utf-8') as fp:
+        data = json.load(fp)
+        DEFAULT_PLUGIN_MAXSIZE = {
+            "scalar": data.get('scalar_sample', 1000),
+            "image": data.get('image_sample', 10),
+            "histogram": data.get('histogram_sample', 100),
+            "embeddings": data.get('embedding_sample', 50000),
+            "audio": data.get('audio_sample', 10),
+            "pr_curve": data.get('pr_curve_sample', 300),
+            "meta_data": 100
+        }
+except Exception:
+    DEFAULT_PLUGIN_MAXSIZE = {
+        "scalar": 1000,
+        "image": 10,
+        "histogram": 100,
+        "embeddings": 50000,
+        "audio": 10,
+        "pr_curve": 300,
+        "meta_data": 100
+    }
 
 
 class Reservoir(object):
diff --git a/visualdl/server/serve.py b/visualdl/server/serve.py
index 264b6a25dcd4042f4408306b107ff8f6c61e1126..3c0beec46eaec9733d42e9e5980e32e335966963 100644
--- a/visualdl/server/serve.py
+++ b/visualdl/server/serve.py
@@ -25,7 +25,7 @@ from visualdl.server.log import logger
 
 
 def get_server_url():
-    with open(CONFIG_PATH, 'r') as fp:
+    with open(CONFIG_PATH, 'r', encoding='utf-8') as fp:
         server_url = json.load(fp)['server_url']
     return server_url
 
diff --git a/visualdl/utils/dir.py b/visualdl/utils/dir.py
index 7841720984ab9b66788110f45a6fb2ab1f1eaccc..afb9b21dd8ccf4b6b0722d0dea7b90878d14d4ab 100644
--- a/visualdl/utils/dir.py
+++ b/visualdl/utils/dir.py
@@ -33,5 +33,5 @@ def init_vdl_config():
     if not os.path.exists(CONF_HOME):
         os.makedirs(CONF_HOME)
     if not os.path.exists(CONFIG_PATH) or 0 == os.path.getsize(CONFIG_PATH):
-        with open(CONFIG_PATH, 'w') as fp:
+        with open(CONFIG_PATH, 'w', encoding='utf-8') as fp:
             fp.write(json.dumps(default_vdl_config))