diff --git a/src/nni_manager/common/experimentStartupInfo.ts b/src/nni_manager/common/experimentStartupInfo.ts
index 5675facdde..ba8bd8789b 100644
--- a/src/nni_manager/common/experimentStartupInfo.ts
+++ b/src/nni_manager/common/experimentStartupInfo.ts
@@ -43,7 +43,7 @@ class ExperimentStartupInfo {
         this.initialized = true;
 
         if (logDir !== undefined && logDir.length > 0) {
-            this.logDir = path.join(logDir, getExperimentId());
+            this.logDir = path.join(path.normalize(logDir), getExperimentId());
         } else {
             this.logDir = path.join(os.homedir(), 'nni', 'experiments', getExperimentId());
         }
diff --git a/src/nni_manager/training_service/common/util.ts b/src/nni_manager/training_service/common/util.ts
index ef05ac57b3..294728ee6d 100644
--- a/src/nni_manager/training_service/common/util.ts
+++ b/src/nni_manager/training_service/common/util.ts
@@ -70,11 +70,11 @@ export async function validateCodeDir(codeDir: string) : Promise<number> {
  */
 export async function execMkdir(directory: string, share: boolean = false): Promise<void> {
     if (process.platform === 'win32') {
-        await cpp.exec(`powershell.exe New-Item -Path ${directory} -ItemType "directory" -Force`);
+        await cpp.exec(`powershell.exe New-Item -Path "${directory}" -ItemType "directory" -Force`);
     } else if (share) {
-        await cpp.exec(`(umask 0; mkdir -p ${directory})`);
+        await cpp.exec(`(umask 0; mkdir -p '${directory}')`);
     } else {
-        await cpp.exec(`mkdir -p ${directory}`);
+        await cpp.exec(`mkdir -p '${directory}'`);
     }
 
     return Promise.resolve();
@@ -87,9 +87,9 @@ export async function execMkdir(directory: string, share: boolean = false): Prom
  */
 export async function execCopydir(source: string, destination: string): Promise<void> {
     if (process.platform === 'win32') {
-        await cpp.exec(`powershell.exe Copy-Item ${source} -Destination ${destination} -Recurse`);
+        await cpp.exec(`powershell.exe Copy-Item "${source}" -Destination "${destination}" -Recurse`);
     } else {
-        await cpp.exec(`cp -r ${source} ${destination}`);
+        await cpp.exec(`cp -r '${source}' '${destination}'`);
     }
 
     return Promise.resolve();
@@ -101,9 +101,9 @@ export async function execCopydir(source: string, destination: string): Promise<
  */
 export async function execNewFile(filename: string): Promise<void> {
     if (process.platform === 'win32') {
-        await cpp.exec(`powershell.exe New-Item -Path ${filename} -ItemType "file" -Force`);
+        await cpp.exec(`powershell.exe New-Item -Path "${filename}" -ItemType "file" -Force`);
     } else {
-        await cpp.exec(`touch ${filename}`);
+        await cpp.exec(`touch '${filename}'`);
     }
 
     return Promise.resolve();
@@ -115,9 +115,9 @@ export async function execNewFile(filename: string): Promise<void> {
  */
 export function runScript(filePath: string): cp.ChildProcess {
     if (process.platform === 'win32') {
-        return cp.exec(`powershell.exe -ExecutionPolicy Bypass -file ${filePath}`);
+        return cp.exec(`powershell.exe -ExecutionPolicy Bypass -file "${filePath}"`);
     } else {
-        return cp.exec(`bash ${filePath}`);
+        return cp.exec(`bash '${filePath}'`);
     }
 }
 
@@ -128,9 +128,9 @@ export function runScript(filePath: string): cp.ChildProcess {
 export async function execTail(filePath: string): Promise<cpp.childProcessPromise.Result> {
     let cmdresult: cpp.childProcessPromise.Result;
     if (process.platform === 'win32') {
-        cmdresult = await cpp.exec(`powershell.exe Get-Content ${filePath} -Tail 1`);
+        cmdresult = await cpp.exec(`powershell.exe Get-Content "${filePath}" -Tail 1`);
     } else {
-        cmdresult = await cpp.exec(`tail -n 1 ${filePath}`);
+        cmdresult = await cpp.exec(`tail -n 1 '${filePath}'`);
     }
 
     return Promise.resolve(cmdresult);
@@ -142,9 +142,9 @@ export async function execTail(filePath: string): Promise<cpp.childProcessPromis
  */
 export async function execRemove(directory: string): Promise<void> {
     if (process.platform === 'win32') {
-        await cpp.exec(`powershell.exe Remove-Item ${directory} -Recurse -Force`);
+        await cpp.exec(`powershell.exe Remove-Item "${directory}" -Recurse -Force`);
     } else {
-        await cpp.exec(`rm -rf ${directory}`);
+        await cpp.exec(`rm -rf '${directory}'`);
     }
 
     return Promise.resolve();
@@ -173,7 +173,7 @@ export function setEnvironmentVariable(variable: { key: string; value: string })
     if (process.platform === 'win32') {
         return `$env:${variable.key}="${variable.value}"`;
     } else {
-        return `export ${variable.key}=${variable.value}`;
+        return `export ${variable.key}='${variable.value}'`;
     }
 }
 
diff --git a/src/nni_manager/training_service/local/localTrainingService.ts b/src/nni_manager/training_service/local/localTrainingService.ts
index 2d4d1a1745..17cfc1fab9 100644
--- a/src/nni_manager/training_service/local/localTrainingService.ts
+++ b/src/nni_manager/training_service/local/localTrainingService.ts
@@ -490,18 +490,18 @@ class LocalTrainingService implements TrainingService {
         const script: string[] = [];
         if (process.platform === 'win32') {
             script.push(
-                `cmd.exe /c ${localTrialConfig.command} 2>${path.join(workingDirectory, 'stderr')}`,
+                `cmd.exe /c ${localTrialConfig.command} 2>"${path.join(workingDirectory, 'stderr')}"`,
                 `$NOW_DATE = [int64](([datetime]::UtcNow)-(get-date "1/1/1970")).TotalSeconds`,
                 `$NOW_DATE = "$NOW_DATE" + (Get-Date -Format fff).ToString()`,
-                `Write $LASTEXITCODE " " $NOW_DATE  | Out-File ${path.join(workingDirectory, '.nni', 'state')} -NoNewline -encoding utf8`);
+                `Write $LASTEXITCODE " " $NOW_DATE  | Out-File "${path.join(workingDirectory, '.nni', 'state')}" -NoNewline -encoding utf8`);
         } else {
-            script.push(`eval ${localTrialConfig.command} 2>${path.join(workingDirectory, 'stderr')}`);
+            script.push(`eval ${localTrialConfig.command} 2>"${path.join(workingDirectory, 'stderr')}"`);
             if (process.platform === 'darwin') {
                 // https://superuser.com/questions/599072/how-to-get-bash-execution-time-in-milliseconds-under-mac-os-x
                 // Considering the worst case, write 999 to avoid negative duration
-                script.push(`echo $? \`date +%s999\` >${path.join(workingDirectory, '.nni', 'state')}`);
+                script.push(`echo $? \`date +%s999\` >'${path.join(workingDirectory, '.nni', 'state')}'`);
             } else {
-                script.push(`echo $? \`date +%s%3N\` >${path.join(workingDirectory, '.nni', 'state')}`);
+                script.push(`echo $? \`date +%s%3N\` >'${path.join(workingDirectory, '.nni', 'state')}'`);
             }
         }
 
@@ -522,7 +522,7 @@ class LocalTrainingService implements TrainingService {
         if (process.platform !== 'win32') {
             runScriptContent.push('#!/bin/bash');
         }
-        runScriptContent.push(`cd ${this.localTrialConfig.codeDir}`);
+        runScriptContent.push(`cd '${this.localTrialConfig.codeDir}'`);
         for (const variable of variables) {
             runScriptContent.push(setEnvironmentVariable(variable));
         }