diff --git a/charts/hami/README.md b/charts/hami/README.md
index 2f36a25d87..9df0a684f5 100644
--- a/charts/hami/README.md
+++ b/charts/hami/README.md
@@ -111,6 +111,7 @@ This document provides detailed descriptions of all configurable values paramete
 | `scheduler.admissionWebhook.customURL.host` | Custom URL host | `127.0.0.1` |
 | `scheduler.admissionWebhook.customURL.port` | Custom URL port | `31998` |
 | `scheduler.admissionWebhook.customURL.path` | Custom URL path | `/webhook` |
+| `scheduler.admissionWebhook.manageNamespaceSelector` | Whether the chart renders and manages the webhook namespaceSelector field | `true` |
 | `scheduler.admissionWebhook.reinvocationPolicy` | Reinvocation policy | `Never` |
 | `scheduler.admissionWebhook.failurePolicy` | Failure policy | `Ignore` |
 
diff --git a/charts/hami/templates/scheduler/webhook.yaml b/charts/hami/templates/scheduler/webhook.yaml
index d46a109cfd..28beb9dd44 100644
--- a/charts/hami/templates/scheduler/webhook.yaml
+++ b/charts/hami/templates/scheduler/webhook.yaml
@@ -23,6 +23,7 @@ webhooks:
     failurePolicy: {{ .Values.scheduler.admissionWebhook.failurePolicy }}
     matchPolicy: Equivalent
     name: vgpu.hami.io
+    {{- if or (not (hasKey .Values.scheduler.admissionWebhook "manageNamespaceSelector")) .Values.scheduler.admissionWebhook.manageNamespaceSelector }}
     namespaceSelector:
       {{- if .Values.scheduler.admissionWebhook.namespaceSelector.matchLabels }}
       matchLabels:
@@ -42,6 +43,7 @@ webhooks:
       {{- if .Values.scheduler.admissionWebhook.namespaceSelector.matchExpressions }}
       {{- toYaml .Values.scheduler.admissionWebhook.namespaceSelector.matchExpressions | nindent 6 }}
       {{- end }}
+    {{- end }}
     objectSelector:
       {{- if .Values.scheduler.admissionWebhook.objectSelector.matchLabels }}
       matchLabels:
diff --git a/charts/hami/values.yaml b/charts/hami/values.yaml
index ed1a818f64..6d39789737 100644
--- a/charts/hami/values.yaml
+++ b/charts/hami/values.yaml
@@ -176,6 +176,11 @@ scheduler:
       # - default
       # - kube-system
       # - istio-system
+    # manageNamespaceSelector controls whether the chart renders and manages the webhook's
+    # namespaceSelector field. Keep it true on standard Kubernetes clusters.
+    # Set it to false on managed platforms (e.g. AKS) where the platform mutates and owns
+    # the namespaceSelector field, to avoid server-side apply ownership conflicts.
+    manageNamespaceSelector: true
     # namespaceSelector controls which namespaces the webhook will be applied to.
     # The default matchExpressions exclude namespaces with label "hami.io/webhook: ignore".
     # You can add additional matchLabels or matchExpressions to further filter namespaces.