diff --git a/api-runtime/rest-runtime/admin-web/html/vpc-subnet.html b/api-runtime/rest-runtime/admin-web/html/vpc-subnet.html
index c42303600..12c61b251 100644
--- a/api-runtime/rest-runtime/admin-web/html/vpc-subnet.html
+++ b/api-runtime/rest-runtime/admin-web/html/vpc-subnet.html
@@ -1018,19 +1018,11 @@ <h2>System ID (Managed by CSP)</h2>
     }
 
     function showOverlay() {
-        const region = '{{.RegionName}}';
         const regionId = '{{.Region}}';
         const defaultZone = '{{.Zone}}';
-        const vpcNameInput = document.getElementById('vpcName');
-        const subnetNameInput = document.getElementById('subnetName');
         const zoneSelect = document.getElementById('subnetZone');
         const connConfig = document.getElementById('connConfig').value;
 
-        vpcNameInput.value = `${region}-vpc-${Math.random().toString(36).substring(2, 5)}`;
-        document.getElementById('vpcCIDR').value = '10.0.0.0/16';
-        subnetNameInput.value = `${region}-${defaultZone}-subnet-${Math.random().toString(36).substring(2, 5)}`;
-        document.getElementById('subnetCIDR').value = '10.0.1.0/24';
-
         fetch(`/spider/regionzone/${regionId}?ConnectionName=${connConfig}`)
             .then(response => response.json())
             .then(data => {
@@ -1075,12 +1067,16 @@ <h2>System ID (Managed by CSP)</h2>
         const vpcNameInput = document.getElementById('vpcName');
         const subnetNameInput = document.getElementById('subnetName');
         const zoneInput = document.getElementById('subnetZone');
+        const connConfig = document.getElementById('connConfig').value;
+        const vpcCIDRInput = document.getElementById('vpcCIDR');
+        const subnetCIDRInput = document.getElementById('subnetCIDR');
 
         vpcNameInput.value = `${region}-vpc-${Math.random().toString(36).substring(2, 5)}`;
-        document.getElementById('vpcCIDR').value = '10.0.0.0/16';
+        vpcCIDRInput.value = '10.0.0.0/16';
+        disableGCPCIDR(connConfig);
         zoneInput.value = zone;
         subnetNameInput.value = `${region}-${zone}-subnet-${Math.random().toString(36).substring(2, 5)}`;
-        document.getElementById('subnetCIDR').value = '10.0.1.0/24';
+        subnetCIDRInput.value = '10.0.1.0/24';
 
         document.querySelectorAll('.vpc-tag-input, .subnet-tag-input').forEach(tagInput => tagInput.remove());
     }
@@ -1761,5 +1757,16 @@ <h2>System ID (Managed by CSP)</h2>
         selection.removeAllRanges();
     }
 
+    // Disable VPC CIDR Input in GCP
+    function disableGCPCIDR(connConfig){
+        const vpcCIDRInput = document.getElementById('vpcCIDR');
+        if (currentProvider == 'GCP') {
+            vpcCIDRInput.disabled = true;
+            vpcCIDRInput.value = 'NA';
+            vpcCIDRInput.style.color = 'gray';
+            vpcCIDRInput.style.backgroundColor = '#f0f0f0';
+        }
+    }
+
 </script>
 </html>