diff --git a/.gitignore b/.gitignore
index 8fe0180..822bfab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,6 +44,9 @@ build_*/
 *.dylib
 *.dll
 
+# 但 engines/release/ 中的引擎 DLL 需要跟踪（用户运行必备）
+!engines/release/dynamics_*.dll
+
 # 可执行文件（保留源码，排除编译出的二进制）
 # 注意：Windows 下 .exe 后缀的可执行文件
 *.exe
diff --git a/dynamics.py b/dynamics.py
index 47a43b4..a8d0422 100644
--- a/dynamics.py
+++ b/dynamics.py
@@ -248,23 +248,13 @@ def run_case(config_path, runtime_base, input_dir="input", output_dir="output",
                 input_dir_abs = str(input_dir_path.resolve())
                 output_dir_abs = str(output_dir_path.resolve())
 
-                # ── 优先尝试 DLL 路径（无文件 I/O，直接输出 display.npz）──
-                _dll_used = False
-                try:
-                    from engines.engine_dll import is_dll_available
-                    if is_dll_available(engine):
-                        compute.run_engine_dll(engine, output_dir_abs, config)
-                        _dll_used = True
-                        print(f"[run] DLL 路径成功")
-                except Exception as _dll_err:
-                    print(f"[run] DLL 路径不可用 ({_dll_err})，回退到子进程模式")
-
-                if not _dll_used:
-                    # 回退：子进程模式（读写 display.txt / trajectory.txt）
-                    traj_x, traj_y, traj_z, traj_vx, traj_vy, traj_vz = compute.run_engine(
-                        engine, input_dir_abs, output_dir_abs, config)
-                    if int(config.get("save_trajectory", 0)):
-                        compute.save_trajectory_txt(traj_x, traj_y, traj_z, traj_vx, traj_vy, traj_vz, str(runtime_base))
+                # ── DLL 路径（无文件 I/O，直接输出 display.npz）──
+                from engines.engine_dll import is_dll_available
+                if not is_dll_available(engine):
+                    raise FileNotFoundError(
+                        f"DLL 未找到（引擎 {engine}）。"
+                        f"请先编译：cd engines/{engine} && make dll")
+                compute.run_engine_dll(engine, output_dir_abs, config)
 
             _elapsed = _time.time() - _t0
             print(f"[run] 引擎: {engine}  计算完成: {record_steps} 步  {_elapsed:.3f} s")
diff --git a/engines/release/dynamics_c.dll b/engines/release/dynamics_c.dll
new file mode 100644
index 0000000..f10c8b6
Binary files /dev/null and b/engines/release/dynamics_c.dll differ
diff --git a/engines/release/dynamics_cpp.dll b/engines/release/dynamics_cpp.dll
new file mode 100644
index 0000000..dfa7ce3
Binary files /dev/null and b/engines/release/dynamics_cpp.dll differ
diff --git a/engines/release/dynamics_f90.dll b/engines/release/dynamics_f90.dll
new file mode 100644
index 0000000..c72fd9f
Binary files /dev/null and b/engines/release/dynamics_f90.dll differ