diff --git a/.config/nextest.toml b/.config/nextest.toml
index 89e92f0..b7284ed 100644
--- a/.config/nextest.toml
+++ b/.config/nextest.toml
@@ -30,6 +30,12 @@ test-threads = 4
 failure-output = "final"
 status-level = "fail"
 
+[profile.ci.junit]
+# JUnit XML 輸出設定 - CI 環境專用
+path = "junit.xml"
+store-success-output = true
+store-failure-output = true
+
 [profile.quick]
 # 快速測試設定
 retries = 0
diff --git a/.github/workflows/build-test-audit-coverage.yml b/.github/workflows/build-test-audit-coverage.yml
index c4eef53..632dca8 100644
--- a/.github/workflows/build-test-audit-coverage.yml
+++ b/.github/workflows/build-test-audit-coverage.yml
@@ -69,6 +69,15 @@ jobs:
       env:
         RUST_LOG: debug
 
+    # Upload test results to Codecov
+    - name: Upload test results to Codecov
+      if: ${{ always() }}
+      uses: codecov/test-results-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: target/nextest/ci/junit.xml
+        flags: ${{ matrix.os }}
+
   security:
     name: Security Audit
     runs-on: ubuntu-latest
@@ -116,3 +125,12 @@ jobs:
       with:
         files: lcov.info
         fail_ci_if_error: false
+
+    # Upload test results to Codecov
+    - name: Upload test results to Codecov
+      if: ${{ always() }}
+      uses: codecov/test-results-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: target/nextest/ci/junit.xml
+        flags: coverage
diff --git a/.gitignore b/.gitignore
index dc373dd..8f23f23 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,7 @@ Thumbs.db
 # Environment variables
 .env
 *.log
+
+# JUnit XML test results
+junit.xml
+target/nextest/*/junit.xml
diff --git a/docs/testing-guidelines.md b/docs/testing-guidelines.md
index df388a1..bb3da18 100644
--- a/docs/testing-guidelines.md
+++ b/docs/testing-guidelines.md
@@ -650,6 +650,26 @@ fn test_with_performance_monitoring() {
 }
 ```
 
+## JUnit XML Test Results
+
+### Configuration
+The project uses nextest to generate JUnit XML format test results, primarily for CI environments:
+
+```bash
+# CI profile automatically generates JUnit XML
+cargo nextest run --profile ci
+```
+
+### Output Location
+- JUnit XML file: `target/nextest/ci/junit.xml`
+- Contains detailed output and stack traces for all tests (successful and failed)
+
+### Codecov Test Analysis
+Test results are automatically uploaded to Codecov, providing:
+- Test execution time analysis
+- Failure rate statistics
+- Flaky test identification
+
 ## Conclusion
 
 Following these guidelines ensures that SubX maintains high code quality, safety, and testability. The dependency injection architecture enables comprehensive testing without sacrificing safety or performance.