diff --git a/Makefile b/Makefile
index 6e8513e06c..c8edb5d650 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,8 @@
 # Setting variables
 
 SHELL := /bin/bash
+PIP_INSTALL := python3 -m pip install
+PIP_UNINSTALL := python3 -m pip uninstall
 
 ## Install directories
 ifeq ($(shell id -u), 0)  # is root
@@ -146,8 +148,8 @@ dev-install:
 
 .PHONY: uninstall
 uninstall:
-	-pip3 uninstall -y nni
-	-pip3 uninstall -y nnictl
+	-$(PIP_UNINSTALL) -y nni
+	-$(PIP_UNINSTALL) -y nnictl
 	-rm -rf $(INSTALL_PREFIX)/nni
 	-rm -f $(BIN_PATH)/nnimanager
 	-rm -f $(BIN_PATH)/nnictl
@@ -222,10 +224,10 @@ install-node-modules:
 .PHONY: install-dev-modules
 install-dev-modules:
 	#$(_INFO) Installing Python SDK $(_END)
-	cd src/sdk/pynni && pip3 install $(PIP_MODE) -e .
+	cd src/sdk/pynni && $(PIP_INSTALL) $(PIP_MODE) -e .
 	
 	#$(_INFO) Installing nnictl $(_END)
-	cd tools && pip3 install $(PIP_MODE) -e .
+	cd tools && $(PIP_INSTALL) $(PIP_MODE) -e .
 	
 	mkdir -p $(INSTALL_PREFIX)/nni
 	
diff --git a/src/nni_manager/common/utils.ts b/src/nni_manager/common/utils.ts
index ba0650ef28..f272ea22b1 100644
--- a/src/nni_manager/common/utils.ts
+++ b/src/nni_manager/common/utils.ts
@@ -161,10 +161,6 @@ function parseArg(names: string[]): string {
 function getMsgDispatcherCommand(tuner: any, assessor: any): string {
     let command: string = `python3 -m nni --tuner_class_name ${tuner.className}`;
 
-    if (process.env.VIRTUAL_ENV) {
-        command = path.join(process.env.VIRTUAL_ENV, 'bin/') +command;
-    }
-
     if (tuner.classArgs !== undefined) {
         command += ` --tuner_args ${JSON.stringify(JSON.stringify(tuner.classArgs))}`;
     }
diff --git a/src/nni_manager/core/nnimanager.ts b/src/nni_manager/core/nnimanager.ts
index 48d9fa3c83..f562598b11 100644
--- a/src/nni_manager/core/nnimanager.ts
+++ b/src/nni_manager/core/nnimanager.ts
@@ -236,14 +236,16 @@ class NNIManager implements Manager {
             newCwd = cwd;
         }
         // TO DO: add CUDA_VISIBLE_DEVICES
+        let nniEnv = {
+            NNI_MODE: mode,
+            NNI_CHECKPOINT_DIRECTORY: dataDirectory,
+            NNI_LOG_DIRECTORY: getLogDir()
+        };
+        let newEnv = Object.assign({}, process.env, nniEnv);
         const tunerProc: ChildProcess = spawn(command, [], {
             stdio,
             cwd: newCwd,
-            env: {
-                NNI_MODE: mode,
-                NNI_CHECKPOINT_DIRECTORY: dataDirectory,
-                NNI_LOG_DIRECTORY: getLogDir()
-            },
+            env: newEnv,
             shell: true
         });
         this.dispatcherPid = tunerProc.pid;