diff --git a/src/nni_manager/training_service/pai/paiK8S/paiK8STrainingService.ts b/src/nni_manager/training_service/pai/paiK8S/paiK8STrainingService.ts
index f9be655711..a7a02e5cc7 100644
--- a/src/nni_manager/training_service/pai/paiK8S/paiK8STrainingService.ts
+++ b/src/nni_manager/training_service/pai/paiK8S/paiK8STrainingService.ts
@@ -158,7 +158,7 @@ class PAIK8STrainingService extends PAITrainingService {
         if (this.paiTrialConfig === undefined) {
             throw new Error('trial config is not initialized');
         }
-        const containerNFSExpCodeDir = `${this.paiTrialConfig.containerNFSMountPath}/${this.experimentId}/'nni-code`;
+        const containerNFSExpCodeDir = `${this.paiTrialConfig.containerNFSMountPath}/${this.experimentId}/nni-code`;
         const containerWorkingDir: string = `${this.paiTrialConfig.containerNFSMountPath}/${this.experimentId}/${trialJobDetail.id}`;
         const nniManagerIp: string = this.nniManagerIpConfig ? this.nniManagerIpConfig.nniManagerIp : getIPV4Address();
         const nniPaiTrialCommand: string = String.Format(