diff --git a/.github/workflows/ci_v2_shadow.yml b/.github/workflows/ci_v2_shadow.yml
index 25f02a11..ef44af65 100644
--- a/.github/workflows/ci_v2_shadow.yml
+++ b/.github/workflows/ci_v2_shadow.yml
@@ -27,11 +27,50 @@ on:
     branches: ["master", "ci/ci-online"]
 
 jobs:
+  plugin-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      platform: ${{ steps.select.outputs.platform }}
+      requires_full_matrix: ${{ steps.select.outputs.requires_full_matrix }}
+      matrix_json: ${{ steps.select.outputs.matrix_json }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Collect changed paths
+        if: github.event_name == 'pull_request'
+        run: |
+          git diff --name-only \
+            "${{ github.event.pull_request.base.sha }}" \
+            "${{ github.sha }}" > changed_paths.txt
+
+      - name: Select active platforms
+        id: select
+        run: |
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" && "${{ inputs.platform }}" != "active" ]]; then
+            if [[ "${{ inputs.platform }}" == "all" ]]; then
+              echo "platform=nvidia,iluvatar,metax,moore,cambricon,ascend" >> "$GITHUB_OUTPUT"
+            else
+              echo "platform=${{ inputs.platform }}" >> "$GITHUB_OUTPUT"
+            fi
+            echo "requires_full_matrix=false" >> "$GITHUB_OUTPUT"
+            echo 'matrix_json={}' >> "$GITHUB_OUTPUT"
+          elif [[ "${{ github.event_name }}" == "pull_request" ]]; then
+            python scripts/infini_ops_plugin_test_matrix.py --github-output < changed_paths.txt >> "$GITHUB_OUTPUT"
+          else
+            echo "platform=nvidia,iluvatar,metax,moore,cambricon,ascend" >> "$GITHUB_OUTPUT"
+            echo "requires_full_matrix=true" >> "$GITHUB_OUTPUT"
+            echo 'matrix_json={}' >> "$GITHUB_OUTPUT"
+          fi
+
   ci-v2-shadow:
+    needs: plugin-matrix
+    if: needs.plugin-matrix.outputs.platform != ''
     uses: InfiniTensor/ci/.github/workflows/infiniops-ci-v2-shadow.yml@b45d360c8cc529747ee31c5451d7eac96ac9f309
     with:
       config_path: .github/ci_config.yml
       ci_ref: b45d360c8cc529747ee31c5451d7eac96ac9f309
       max_parallel: 10
-      platform: ${{ github.event_name == 'workflow_dispatch' && (inputs.platform == 'all' && 'nvidia,iluvatar,metax,moore,cambricon,ascend' || inputs.platform == 'active' && 'nvidia,iluvatar,metax,moore,cambricon,ascend' || inputs.platform) || 'nvidia,iluvatar,metax,moore,cambricon,ascend' }}
+      platform: ${{ needs.plugin-matrix.outputs.platform }}
     secrets: inherit
diff --git a/scripts/infini_ops_plugin_test_matrix.py b/scripts/infini_ops_plugin_test_matrix.py
index 86d4120f..5b0a4984 100644
--- a/scripts/infini_ops_plugin_test_matrix.py
+++ b/scripts/infini_ops_plugin_test_matrix.py
@@ -138,6 +138,16 @@ def _read_paths(args):
     return [line.strip() for line in sys.stdin if line.strip()]
 
 
+def _print_github_output(matrix):
+    platform = ",".join(matrix["ci_platforms"])
+    requires_full_matrix = str(matrix["requires_full_matrix"]).lower()
+    compact_json = json.dumps(matrix, sort_keys=True, separators=(",", ":"))
+
+    print(f"platform={platform}")
+    print(f"requires_full_matrix={requires_full_matrix}")
+    print(f"matrix_json={compact_json}")
+
+
 def main(argv=None):
     parser = argparse.ArgumentParser(
         description="Map changed paths to `infini::ops` plugin test devices."
@@ -151,11 +161,19 @@ def main(argv=None):
             "to include external plugin roots."
         ),
     )
+    parser.add_argument(
+        "--github-output",
+        action="store_true",
+        help="Print `$GITHUB_OUTPUT` compatible key/value lines.",
+    )
     parser.add_argument("paths", nargs="*", help="Changed paths to classify.")
     args = parser.parse_args(argv)
 
     matrix = build_test_matrix(args.plugin_root or ["plugins"], _read_paths(args))
-    print(json.dumps(matrix, indent=2, sort_keys=True))
+    if args.github_output:
+        _print_github_output(matrix)
+    else:
+        print(json.dumps(matrix, indent=2, sort_keys=True))
 
 
 if __name__ == "__main__":
diff --git a/tests/test_plugin_test_matrix.py b/tests/test_plugin_test_matrix.py
index 461ec296..d2231a2f 100644
--- a/tests/test_plugin_test_matrix.py
+++ b/tests/test_plugin_test_matrix.py
@@ -132,6 +132,41 @@ def test_matrix_accepts_multiple_plugin_roots(tmp_path):
     assert matrix["ci_platforms"] == []
 
 
+def test_cli_outputs_github_output_format():
+    repo = pathlib.Path(__file__).resolve().parents[1]
+    script = repo / "scripts" / "infini_ops_plugin_test_matrix.py"
+
+    result = subprocess.run(
+        [
+            sys.executable,
+            str(script),
+            "--plugin-root",
+            str(_plugin_root()),
+            "--github-output",
+            "src/native/cuda/nvidia/ops/add/add.cu",
+        ],
+        check=True,
+        stdout=subprocess.PIPE,
+        text=True,
+    )
+
+    assert "platform=nvidia" in result.stdout.splitlines()
+    assert "requires_full_matrix=false" in result.stdout.splitlines()
+
+
+def test_shadow_ci_uses_path_aware_platform_output():
+    workflow = (
+        pathlib.Path(__file__).resolve().parents[1]
+        / ".github"
+        / "workflows"
+        / "ci_v2_shadow.yml"
+    ).read_text(encoding="utf-8")
+
+    assert "plugin-matrix:" in workflow
+    assert "scripts/infini_ops_plugin_test_matrix.py --github-output" in workflow
+    assert "needs.plugin-matrix.outputs.platform" in workflow
+
+
 def test_cli_outputs_json_matrix(tmp_path):
     repo = pathlib.Path(__file__).resolve().parents[1]
     script = repo / "scripts" / "infini_ops_plugin_test_matrix.py"