diff --git a/service/help.md b/service/help.md
new file mode 100644
index 00000000..a5d44c1a
--- /dev/null
+++ b/service/help.md
@@ -0,0 +1 @@
+### 服务
\ No newline at end of file
diff --git a/tool/help.md b/tool/help.md
new file mode 100644
index 00000000..800a6a35
--- /dev/null
+++ b/tool/help.md
@@ -0,0 +1 @@
+### 工具
\ No newline at end of file
diff --git a/tool/system/os.go b/tool/system/os.go
new file mode 100644
index 00000000..5af0d39e
--- /dev/null
+++ b/tool/system/os.go
@@ -0,0 +1,18 @@
+package system
+
+import "runtime"
+
+// IsMac 是否为Mac
+func IsMac() bool {
+	return runtime.GOOS == "darwin"
+}
+
+// IsWindows 是否为Windows
+func IsWindows() bool {
+	return runtime.GOOS == "windows"
+}
+
+// IsLinux 是否为Linux
+func IsLinux() bool {
+	return runtime.GOOS == "linux"
+}
diff --git a/tool/system/os_test.go b/tool/system/os_test.go
new file mode 100644
index 00000000..592657c0
--- /dev/null
+++ b/tool/system/os_test.go
@@ -0,0 +1,33 @@
+package system
+
+import "testing"
+
+func TestIsMac(t *testing.T) {
+	t.Log(IsMac())
+}
+
+func BenchmarkIsMac(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		IsMac()
+	}
+}
+
+func TestIsWindows(t *testing.T) {
+	t.Log(IsWindows())
+}
+
+func BenchmarkIsWindows(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		IsWindows()
+	}
+}
+
+func TestIsLinux(t *testing.T) {
+	t.Log(IsWindows())
+}
+
+func BenchmarkIsLinux(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		IsWindows()
+	}
+}