diff --git a/kustomization.yaml b/kustomization.yaml
index d03ff5a..d79659f 100644
--- a/kustomization.yaml
+++ b/kustomization.yaml
@@ -6,6 +6,7 @@ resources:
   - application.yaml
 
   # Core infrastructure
+  - priority-classes/argocd.yaml
   - cert-manager/argocd.yaml
   - traefik/argocd.yaml
   - argocd-image-updater/argocd.yaml
diff --git a/priority-classes/argocd.yaml b/priority-classes/argocd.yaml
new file mode 100644
index 0000000..dcff80e
--- /dev/null
+++ b/priority-classes/argocd.yaml
@@ -0,0 +1,17 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: priority-classes
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: https://github.com/Mayne0213/platform.git
+    targetRevision: HEAD
+    path: priority-classes/manifests
+  destination:
+    server: https://kubernetes.default.svc
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
diff --git a/priority-classes/manifests/kustomization.yaml b/priority-classes/manifests/kustomization.yaml
new file mode 100644
index 0000000..8ba8781
--- /dev/null
+++ b/priority-classes/manifests/kustomization.yaml
@@ -0,0 +1,5 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - priority-classes.yaml
diff --git a/priority-classes/manifests/priority-classes.yaml b/priority-classes/manifests/priority-classes.yaml
new file mode 100644
index 0000000..05cb295
--- /dev/null
+++ b/priority-classes/manifests/priority-classes.yaml
@@ -0,0 +1,28 @@
+# High Priority (1000) - Critical infrastructure
+# ArgoCD, Gitea, CNPG, Vault, MinIO
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: high-priority
+value: 1000
+globalDefault: false
+description: "High priority for critical infrastructure"
+---
+# Medium Priority (500) - Observability stack
+# Thanos, Prometheus, Loki, Tempo
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: medium-priority
+value: 500
+globalDefault: false
+description: "Medium priority for observability stack"
+---
+# Low Priority (100) - Everything else
+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: low-priority
+value: 100
+globalDefault: true
+description: "Low priority for all other applications"