diff --git a/scripts/ci/release-client.sh b/scripts/ci/release-client.sh
index 953d600..b007823 100644
--- a/scripts/ci/release-client.sh
+++ b/scripts/ci/release-client.sh
@@ -44,8 +44,13 @@ for line in raw.splitlines(keepends=True):
     if line.startswith('version:'):
         out.append('version: "%s"\n' % ver)
     elif line.startswith('build_number:'):
+        # build_number 由版本号公式派生(major*10000+minor*100+patch),与 pubspec
+        # 的 CFBundleVersion 同源、天然单调。旧法「读仓库 version.yaml +1」有 bug:
+        # CI/本地发版都不回写仓库那份,它永远冻结 → 每次都算出同一个值(见 1.1.9/1.1.10
+        # 均为 5 的历史)。改公式后无状态依赖,CI 与 local-release 结果一致。
         try:
-            b = int(line.split(':', 1)[1].strip()) + 1
+            _mj, _mn, _pt = (int(x) for x in ver.split('.')[:3])
+            b = _mj * 10000 + _mn * 100 + _pt
         except Exception:
             b = 1
         out.append('build_number: %d\n' % b)
diff --git a/scripts/local-release.sh b/scripts/local-release.sh
index 1c13fca..4d9e663 100755
--- a/scripts/local-release.sh
+++ b/scripts/local-release.sh
@@ -381,8 +381,12 @@ for line in raw.splitlines(keepends=True):
     if line.startswith('version:'):
         out.append('version: "%s"\n' % ver)
     elif line.startswith('build_number:'):
+        # build_number 由版本号公式派生(major*10000+minor*100+patch),与 pubspec
+        # 的 CFBundleVersion(BUILD)同源、天然单调。旧法「读仓库 version.yaml +1」有 bug:
+        # 仓库那份从不回写、永远冻结 → 每次都算出同一个值(1.1.9/1.1.10 均为 5)。
         try:
-            b = int(line.split(':', 1)[1].strip()) + 1
+            _mj, _mn, _pt = (int(x) for x in ver.split('.')[:3])
+            b = _mj * 10000 + _mn * 100 + _pt
         except Exception:
             b = 1
         out.append('build_number: %d\n' % b)