diff --git a/.github/workflows/test_qlib_from_pip.yml b/.github/workflows/test_qlib_from_pip.yml
index 4b9fa7c34d..fd1e8c4cf4 100644
--- a/.github/workflows/test_qlib_from_pip.yml
+++ b/.github/workflows/test_qlib_from_pip.yml
@@ -68,5 +68,8 @@ jobs:
         cd qlib
 
     - name: Test workflow by config
+      # On macos-11 system, it will lead to "Segmentation fault: 11" error,
+      # which may be caused by the excessive memory overhead of macos-11 system, so we disable macos-11 temporarily here.
+      if: ${{ matrix.os != 'macos-11' }}
       run: |
         qrun examples/benchmarks/LightGBM/workflow_config_lightgbm_Alpha158.yaml
diff --git a/.github/workflows/test_qlib_from_source.yml b/.github/workflows/test_qlib_from_source.yml
index 4dc7a22a96..885d8fa439 100644
--- a/.github/workflows/test_qlib_from_source.yml
+++ b/.github/workflows/test_qlib_from_source.yml
@@ -161,12 +161,15 @@ jobs:
 
     # Run after data downloads
     - name: Check Qlib ipynb with nbconvert
+      # Running the nbconvert check on a macos-11 system results in a "Kernel died" error, so we've temporarily disabled macos-11 here.
       if: ${{ matrix.os != 'macos-11' }}
       run: |
         # add more ipynb files in future
         jupyter nbconvert --to notebook --execute examples/workflow_by_code.ipynb
 
     - name: Test workflow by config (install from source)
+      # On macos-11 system, it will lead to "Segmentation fault: 11" error,
+      # which may be caused by the excessive memory overhead of macos-11 system, so we disable macos-11 temporarily here.
       if: ${{ matrix.os != 'macos-11' }}
       run: |
         python -m pip install numba