diff --git a/.github/workflows/ci-macos.yml b/.github/workflows/ci-macos.yml
index 87fef96..56e7ca7 100644
--- a/.github/workflows/ci-macos.yml
+++ b/.github/workflows/ci-macos.yml
@@ -5,9 +5,34 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v4
+      - name: 构建依赖 blockmalloc / slotsboxmalloc / kvspace-c（macOS 无预编译 ABI，源码装 /usr/local）
+        run: |
+          set -euo pipefail
+          for repo in blockmalloc slotsboxmalloc kvspace-c; do
+            git clone --depth 1 "https://github.com/array2d/$repo.git" "/tmp/$repo"
+            cmake -S "/tmp/$repo" -B "/tmp/$repo/build" \
+              -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local
+            cmake --build "/tmp/$repo/build" -j
+            sudo cmake --install "/tmp/$repo/build"
+          done
       - name: 构建
         run: |
           cmake -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local
           cmake --build build
       - name: 安装（验证安装规则）
         run: sudo cmake --install build
+      - name: 后端装载冒烟（frontend 的 dlopen 真能加载后端）
+        run: |
+          cat > /tmp/conn.c <<'EOF'
+          #include <kvspace/kvspace.h>
+          #include <stdio.h>
+          int main(void) {
+              void *h = kvspaceConnect("shm:///tmp/ks_ci_macos");
+              printf("connect shm:// → %p\n", h);
+              if (h) kvspaceClose(h);
+              return h ? 0 : 1;
+          }
+          EOF
+          cc /tmp/conn.c -o /tmp/conn -I/usr/local/include -L/usr/local/lib/kvspace -lkvspace
+          # libkvspace 在 /usr/local/lib/kvspace；后端依赖 libblockmalloc 在 /usr/local/lib
+          DYLD_FALLBACK_LIBRARY_PATH=/usr/local/lib:/usr/local/lib/kvspace /tmp/conn
diff --git a/src/frontend.c b/src/frontend.c
index a80c7c5..42d8f73 100644
--- a/src/frontend.c
+++ b/src/frontend.c
@@ -4,10 +4,10 @@
  * （RTLD_NOW | RTLD_LOCAL）装载后端，把 handle 包一层 {vtable, dl, backend}。
  * codec（TlvEncode、DecodeHead、New 等）无 handle，由前端静态实现，byte-identical。
  *
- * 后端装载名：
- *   shm://...           → libkvspace-c.so.1
- *   其余（redis/fs/s3） → libkvspace_durable.so.1
- * 目录由 KVSPACE_BACKEND_PATH 覆盖（默认走动态链接器搜索路径）。
+ * 后端装载名（后缀随平台）：
+ *   shm://...           → libkvspace-c.so.1       / macOS: libkvspace-c.dylib
+ *   其余（redis/fs/s3） → libkvspace_durable.so.1 / macOS: libkvspace_durable.dylib
+ * 目录由 KVSPACE_BACKEND_PATH 覆盖，默认 Linux /usr/lib/kvspace、macOS /usr/local/lib/kvspace。
  */
 
 #include "kvspace/kvspace.h"
@@ -60,15 +60,27 @@ static kvspace_handle *H(void *h) { return (kvspace_handle *)h; }
 
 /* ── 后端选择 ───────────────────────────────────────────────────────── */
 
+/* 后端库名：Linux 为 .so.1，macOS 为 .dylib。 */
 static const char *backend_soname(const char *dsn) {
-    return (dsn && strncmp(dsn, "shm://", 6) == 0)
-        ? "libkvspace-c.so.1"
-        : "libkvspace_durable.so.1";
+    int is_shm = dsn && strncmp(dsn, "shm://", 6) == 0;
+#if defined(__APPLE__)
+    return is_shm ? "libkvspace-c.dylib" : "libkvspace_durable.dylib";
+#else
+    return is_shm ? "libkvspace-c.so.1" : "libkvspace_durable.so.1";
+#endif
 }
 
+/* 后端目录默认值：Linux /usr/lib/kvspace；macOS /usr/local/lib/kvspace（/usr 受 SIP 保护）。
+ * KVSPACE_BACKEND_PATH 可覆盖。 */
 static char *backend_path(const char *soname, char *buf, size_t cap) {
     const char *dir = getenv("KVSPACE_BACKEND_PATH");
-    if (!dir || !dir[0]) dir = "/usr/lib/kvspace";
+    if (!dir || !dir[0]) {
+#if defined(__APPLE__)
+        dir = "/usr/local/lib/kvspace";
+#else
+        dir = "/usr/lib/kvspace";
+#endif
+    }
     snprintf(buf, cap, "%s/%s", dir, soname);
     return buf;
 }