diff --git a/.gitignore b/.gitignore
index a49a0a6..adfdfb0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,4 +32,5 @@
 *.app
 
 build/
-.DS_Store
\ No newline at end of file
+.DS_Store
+.vscode/
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..9c00106
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,80 @@
+{
+    "files.associations": {
+        "__bit_reference": "cpp",
+        "__bits": "cpp",
+        "__config": "cpp",
+        "__debug": "cpp",
+        "__errc": "cpp",
+        "__hash_table": "cpp",
+        "__locale": "cpp",
+        "__mutex_base": "cpp",
+        "__node_handle": "cpp",
+        "__nullptr": "cpp",
+        "__split_buffer": "cpp",
+        "__string": "cpp",
+        "__threading_support": "cpp",
+        "__tree": "cpp",
+        "__tuple": "cpp",
+        "array": "cpp",
+        "atomic": "cpp",
+        "bit": "cpp",
+        "bitset": "cpp",
+        "cctype": "cpp",
+        "chrono": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "compare": "cpp",
+        "complex": "cpp",
+        "concepts": "cpp",
+        "condition_variable": "cpp",
+        "cstdarg": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "cwctype": "cpp",
+        "deque": "cpp",
+        "exception": "cpp",
+        "initializer_list": "cpp",
+        "ios": "cpp",
+        "iosfwd": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "locale": "cpp",
+        "map": "cpp",
+        "memory": "cpp",
+        "mutex": "cpp",
+        "new": "cpp",
+        "numbers": "cpp",
+        "numeric": "cpp",
+        "optional": "cpp",
+        "ostream": "cpp",
+        "queue": "cpp",
+        "random": "cpp",
+        "ratio": "cpp",
+        "semaphore": "cpp",
+        "sstream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "string": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "thread": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "typeinfo": "cpp",
+        "unordered_map": "cpp",
+        "variant": "cpp",
+        "vector": "cpp",
+        "*.tcc": "cpp",
+        "algorithm": "cpp",
+        "functional": "cpp",
+        "iterator": "cpp",
+        "memory_resource": "cpp",
+        "utility": "cpp",
+        "stop_token": "cpp"
+    }
+}
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 357a1af..bd30812 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -51,7 +51,7 @@ DeltaT, DeltaTx, DeltaTy, DeltaTz, Hax, Hay and Za for magnetic data.",
 			&noise_para, &forward_type, &mag_field_para, &dimension, &logfile_name});
 		if (logfile_name == "NULL") logfile_name = "gm3d.history.txt";
 		if (in_mshname != "NULL") build_model = false;
-		if (!fp.set_opt('r')) remove_null = true;
+		if (fp.set_opt('r')) remove_null = true;
 
 		// 查看是否通过强制参数检查
 		if (!fp.pass_mandatory()) return 0;
@@ -60,7 +60,7 @@ DeltaT, DeltaTx, DeltaTy, DeltaTz, Hax, Hay and Za for magnetic data.",
 		if (build_model)
 		{
 			gm3d_instance.BuildRegularGrid(dimension.c_str());
-			gm3d_instance.AddModels(modelname.c_str());
+			if (modelname != "NULL") gm3d_instance.AddModels(modelname.c_str());
 			gm3d_instance.RegisteredOuput(remove_null);
 			gm3d_instance.OutMshFile(out_mshname.c_str(), elename);
 		}