diff --git a/.github/actions-rs/grcov.yml b/.github/actions-rs/grcov.yml
new file mode 100644
index 0000000000..9bf818aabe
--- /dev/null
+++ b/.github/actions-rs/grcov.yml
@@ -0,0 +1,3 @@
+ignore-not-existing: true
+output-type: lcov
+output-path: ./lcov.info
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
new file mode 100644
index 0000000000..4aafae0932
--- /dev/null
+++ b/.github/workflows/coverage.yml
@@ -0,0 +1,37 @@
+on: pull_request
+
+name: Code coverage
+
+env:
+  RUST_TOOLCHAIN: nightly-2022-04-03
+
+jobs:
+  grcov:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ env.RUST_TOOLCHAIN }}
+          override: true
+          profile: minimal
+      - name: Execute tests
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --workspace
+        env:
+          CARGO_INCREMENTAL: 0
+          RUSTFLAGS: "-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=abort -Zpanic_abort_tests"
+      - name: Gather coverage data
+        id: coverage
+        uses: actions-rs/grcov@v0.1
+      - name: Codecov upload
+        uses: codecov/codecov-action@v2
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./lcov.info
+          flags: rust
+          fail_ci_if_error: true
+          verbose: true
diff --git a/README.md b/README.md
index f0e3488954..af3a6ae4c6 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,5 @@
 # GreptimeDB
+
+[![codecov](https://codecov.io/gh/GrepTimeTeam/greptimedb/branch/develop/graph/badge.svg?token=FITFDI3J3C)](https://codecov.io/gh/GrepTimeTeam/greptimedb)
+
 GreptimeDB: the next-generation hybrid timeseries/analytics processing database in the cloud.