diff --git a/.ci/clusters/global_env.yaml b/.ci/clusters/global_env.yaml
index 6fd3447b..d8d796c5 100644
--- a/.ci/clusters/global_env.yaml
+++ b/.ci/clusters/global_env.yaml
@@ -4,3 +4,4 @@ metadata:
   name: mesh-global-env
 data:
   global1: globalvalue1
+  shared1: fromglobal
diff --git a/.ci/tests/global.env b/.ci/tests/global.env
deleted file mode 100644
index 9d9500fc..00000000
--- a/.ci/tests/global.env
+++ /dev/null
@@ -1 +0,0 @@
-global1=globalvalue1
diff --git a/.ci/tests/integration/cases/global-and-namespaced-env/env.yaml b/.ci/tests/integration/cases/global-and-namespaced-env/env.yaml
index 75711494..02fc101f 100644
--- a/.ci/tests/integration/cases/global-and-namespaced-env/env.yaml
+++ b/.ci/tests/integration/cases/global-and-namespaced-env/env.yaml
@@ -5,3 +5,4 @@ metadata:
   namespace: default
 data:
   namespaced1: namespacedvalue1
+  shared1: fromnamespace
diff --git a/.ci/tests/integration/cases/global-and-namespaced-env/verify.sh b/.ci/tests/integration/cases/global-and-namespaced-env/verify.sh
index abd11460..5de2bc37 100644
--- a/.ci/tests/integration/cases/global-and-namespaced-env/verify.sh
+++ b/.ci/tests/integration/cases/global-and-namespaced-env/verify.sh
@@ -61,6 +61,15 @@ if [ $? -ne 0 ]; then
   exit 1
 fi
 
+# if global and namespaced env has same key, the value from namespace should be used
+verify_env_result=$(ci::verify_env "function-sample-env" shared1 shared1=fromnamespace 2>&1)
+if [ $? -ne 0 ]; then
+  echo "$verify_env_result"
+  kubectl delete -f "${env_file}" > /dev/null 2>&1
+  kubectl delete -f "${manifests_file}" > /dev/null 2>&1 || true
+  exit 1
+fi
+
 kubectl delete -f "${manifests_file}" > /dev/null 2>&1 || true
 
 # delete the namespaced env, the function can start successfully but without namespaced env injected
@@ -81,6 +90,13 @@ if [ $? -ne 0 ]; then
   exit 1
 fi
 
+verify_env_result=$(ci::verify_env "function-sample-env" shared1 shared1=fromglobal 2>&1)
+if [ $? -ne 0 ]; then
+  echo "$verify_env_result"
+  kubectl delete -f "${manifests_file}" > /dev/null 2>&1 || true
+  exit 1
+fi
+
 verify_env_result=$(ci::verify_env "function-sample-env" namespaced1 "" 2>&1)
 if [ $? -eq 0 ]; then
   echo "e2e-test: ok" | yq eval -