diff --git a/test/generate_coverage.sh b/test/generate_coverage.sh
index c3bfba676..9f5298c35 100755
--- a/test/generate_coverage.sh
+++ b/test/generate_coverage.sh
@@ -18,12 +18,32 @@
 
 set -e
 
-cd $(dirname "$0")/../
+cd "$(dirname "$0")/../"
+repo_root=$PWD
 mkdir -p build && cd build
-cmake ../ -DCMAKE_BUILD_TYPE=Debug -DPAIMON_BUILD_TESTS=ON -DPAIMON_USE_ASAN=ON -DPAIMON_GENERATE_COVERAGE=ON -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+cmake ../ -DCMAKE_BUILD_TYPE=Debug -DPAIMON_BUILD_TESTS=ON -DPAIMON_USE_ASAN=ON -DPAIMON_GENERATE_COVERAGE=ON -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
+    -DPAIMON_ENABLE_AVRO=ON -DPAIMON_ENABLE_ORC=ON \
+    -DPAIMON_ENABLE_MOSAIC=ON -DPAIMON_ENABLE_LANCE=ON -DPAIMON_ENABLE_VORTEX=ON
 make -j
 make test
 lcov --capture --directory src/paimon --directory test --output-file coverage.info
+# Keep only project implementation code in the report: drop system headers,
+# third-party dependencies from the build tree and third_party/, and test
+# sources (*_test.cpp, test helpers, mocks).
+# Anchor exclusions to repository paths so checkout ancestors cannot match.
+# PWD is the build directory; mocks outside testing/ are listed explicitly.
+# Exclusion patterns can overlap or be absent, so unused patterns are nonfatal.
+lcov --remove coverage.info \
+    '/usr/*' \
+    "$PWD/*" \
+    "$repo_root/third_party/*" \
+    "$repo_root/*_test.cpp" \
+    "$repo_root/test/*" \
+    "$repo_root/src/paimon/testing/*" \
+    "$repo_root/src/paimon/rest/mock_rest_server.*" \
+    --ignore-errors unused \
+    --output-file coverage_filtered.info
+mv coverage_filtered.info coverage.info
 genhtml coverage.info --output-directory coverage
 
 ip=$(hostname -I | awk '{print $1}')