diff --git a/tools/gae_deploy.sh b/tools/gae_deploy.sh
index 87d234b7..3680ebdb 100644
--- a/tools/gae_deploy.sh
+++ b/tools/gae_deploy.sh
@@ -1,8 +1,18 @@
 #!/bin/bash
+if [ -z "$GOOGLE_CLOUD_PROJECT" ]; then
+  read -p "Please input your project ID: " GOOGLE_CLOUD_PROJECT
+  if [ -z "$GOOGLE_CLOUD_PROJECT" ]; then
+    echo "Error: Project ID cannot be empty."
+    exit 1
+  fi
+  export GOOGLE_CLOUD_PROJECT
+fi
 gcloud config set project $GOOGLE_CLOUD_PROJECT
-gcloud app create   #select a region for app if it's first time
-python ./kindleear/tools/update_req.py gae
-if [ $? -eq 0 ]; then
+if ! gcloud app describe >/dev/null 2>&1; then
+  gcloud app create   #select a region for app if it's first time
+fi
+
+if python ./kindleear/tools/update_req.py gae; then
   gcloud beta app deploy --version=1 ./kindleear/app.yaml
   gcloud beta app deploy --quiet --version=1 ./kindleear/worker.yaml
   gcloud beta app deploy --quiet --version=1 ./kindleear/cron.yaml
@@ -11,7 +21,6 @@ if [ $? -eq 0 ]; then
   echo -e "The deployment is completed."
   echo -e "The access address is: https://$GOOGLE_CLOUD_PROJECT.appspot.com"
 else
-  echo -e "The deployment is terminated."
+  echo -e "Error: Update requirements failed. The deployment is terminated."
   exit 1
 fi
-