diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 60a2eecc..b188ba0f 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -8,12 +8,13 @@ on:
   pull_request:
 
 env:
+  DEEPLINK_PATH: /mnt/cache/share/deeplinkci/github/${{ github.repository }}
   ENV_SOURCE: /mnt/cache/share/platform/env/dipu_latest
   PROXY_SOURCE: /mnt/cache/share/platform/env/proxy
-  WORKSPACE: /mnt/cache/share/deeplinkci/github/${{ github.repository }}/${{ github.run_number }}
-  CODE_SOURCE: source
-  CLANGD_TIDY_SOURCE: clangd-tidy
   CLANGD_EXEC: /mnt/cache/share/platform/dep/clang-17/bin/clangd
+  WORKSPACE: /mnt/cache/share/deeplinkci/github/${{ github.repository }}/${{ github.run_number }}
+  CODE_SOURCE: /mnt/cache/share/deeplinkci/github/${{ github.repository }}/${{ github.run_number }}/source
+  CLANGD_TIDY_SOURCE: /mnt/cache/share/deeplinkci/github/${{ github.repository }}/${{ github.run_number }}/clangd-tidy
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
@@ -24,6 +25,13 @@ jobs:
     name: checkout code
     runs-on: tps-sco-ci
     steps:
+      - name: clean obsolete workspaces
+        run: |
+          set -euxo pipefail
+          ls -la ${DEEPLINK_PATH}
+          rm -rf ${WORKSPACE}
+          find ${DEEPLINK_PATH} -maxdepth 1 -mmin +60 -type d -exec echo clean {} \&\& echo {} ok \;
+          false
       - name: prepare workspace
         run: |
           set -euxo pipefail