diff --git a/tests/pytest/util/dnodes.py b/tests/pytest/util/dnodes.py
index 2837dce3f89c64ca987760783ca4d3f9b9a09b2d..ff3c271cd8ab1ea2480f3d122513badab09016fc 100644
--- a/tests/pytest/util/dnodes.py
+++ b/tests/pytest/util/dnodes.py
@@ -23,9 +23,9 @@ from util.log import *
 
 
 class TDSimClient:
-    def __init__(self):
+    def __init__(self, path):
         self.testCluster = False
-
+        self.path = path
         self.cfgDict = {
             "numOfLogLines": "100000000",
             "numOfThreadsPerCore": "2.0",
@@ -44,10 +44,7 @@ class TDSimClient:
             "jnidebugFlag": "135",
             "qdebugFlag": "135",
             "telemetryReporting": "0",
-            }
-    def init(self, path):
-        self.__init__()
-        self.path = path
+        }
 
     def getLogDir(self):
         self.logDir = "%s/sim/psim/log" % (self.path)
@@ -64,7 +61,7 @@ class TDSimClient:
         self.cfgDict.update({option: value})
 
     def cfg(self, option, value):
-        cmd = "echo '%s %s' >> %s" % (option, value, self.cfgPath)
+        cmd = "echo %s %s >> %s" % (option, value, self.cfgPath)
         if os.system(cmd) != 0:
             tdLog.exit(cmd)
     def os_string(self,path):
@@ -262,7 +259,7 @@ class TDDnode:
             projPath = selfPath[:selfPath.find("tests")]
 
         for root, dirs, files in os.walk(projPath):
-            if ("taosd" in files):
+            if (("taosd") in files):
                 rootRealPath = os.path.dirname(os.path.realpath(root))
                 if ("packaging" not in rootRealPath):
                     buildPath = root[:len(root)-len("/build/bin")]
@@ -420,7 +417,7 @@ class TDDnode:
             tdLog.exit(cmd)
 
     def cfg(self, option, value):
-        cmd = "echo '%s %s' >> %s" % (option, value, self.cfgPath)
+        cmd = "echo %s %s >> %s" % (option, value, self.cfgPath)
         if os.system(cmd) != 0:
             tdLog.exit(cmd)
 
@@ -496,8 +493,7 @@ class TDDnodes:
         for i in range(len(self.dnodes)):
             self.dnodes[i].init(self.path)
 
-        self.sim = TDSimClient()
-        self.sim.init(self.path)
+        self.sim = TDSimClient(self.path)
 
     def setTestCluster(self, value):
         self.testCluster = value