diff --git a/rqalpha/mod/rqalpha_mod_sys_stock_realtime/event_source.py b/rqalpha/mod/rqalpha_mod_sys_stock_realtime/event_source.py
index 43e9a9e78..9f15aa329 100644
--- a/rqalpha/mod/rqalpha_mod_sys_stock_realtime/event_source.py
+++ b/rqalpha/mod/rqalpha_mod_sys_stock_realtime/event_source.py
@@ -24,7 +24,7 @@
 from rqalpha.environment import Environment
 from rqalpha.utils.logger import system_log
 from rqalpha.events import Event, EVENT
-from rqalpha.utils import json as json_utils
+from rqalpha.utils import rq_json
 from .utils import get_realtime_quotes, order_book_id_2_tushare_code, is_holiday_today, is_tradetime_now
 
 
@@ -45,12 +45,12 @@ def __init__(self, fps):
         self.quotation_engine_thread.daemon = True
 
     def set_state(self, state):
-        persist_dict = json_utils.convert_json_to_dict(state.decode('utf-8'))
+        persist_dict = rq_json.convert_json_to_dict(state.decode('utf-8'))
         self.before_trading_fire_date = persist_dict['before_trading_fire_date']
         self.after_trading_fire_date = persist_dict['after_trading_fire_date']
 
     def get_state(self):
-        return json_utils.convert_dict_to_json({
+        return rq_json.convert_dict_to_json({
             "before_trading_fire_date": self.before_trading_fire_date,
             "after_trading_fire_date": self.after_trading_fire_date,
         }).encode('utf-8')
diff --git a/rqalpha/utils/config.py b/rqalpha/utils/config.py
index 69224e485..8766d5f61 100644
--- a/rqalpha/utils/config.py
+++ b/rqalpha/utils/config.py
@@ -194,9 +194,11 @@ def parse_config(config_args, config_path=None, click_type=True, source_code=Non
             user_system_log.handlers.append(user_std_handler)
 
     if extra_config.context_vars:
-        import base64
-        import json
-        extra_config.context_vars = json.loads(base64.b64decode(extra_config.context_vars).decode('utf-8'))
+        import simplejson as json
+        print(extra_config.context_vars, type(extra_config.context_vars))
+        if isinstance(extra_config.context_vars,  six.string_types):
+            print(to_utf8(extra_config.context_vars))
+            extra_config.context_vars = json.loads(to_utf8(extra_config.context_vars))
 
     if base_config.stock_starting_cash < 0:
         raise patch_user_exc(ValueError(_('invalid stock starting cash: {}').format(base_config.stock_starting_cash)))
diff --git a/rqalpha/utils/json.py b/rqalpha/utils/rq_json.py
similarity index 100%
rename from rqalpha/utils/json.py
rename to rqalpha/utils/rq_json.py