diff --git a/g/os/gfpool/gfpool_z_unit_test.go b/g/os/gfpool/gfpool_z_unit_test.go
new file mode 100644
index 000000000..71587fadd
--- /dev/null
+++ b/g/os/gfpool/gfpool_z_unit_test.go
@@ -0,0 +1,150 @@
+package gfpool_test
+
+import (
+	"github.com/gogf/gf/g/os/gfile"
+	"github.com/gogf/gf/g/os/gfpool"
+	"github.com/gogf/gf/g/os/glog"
+	"github.com/gogf/gf/g/test/gtest"
+	"os"
+	"testing"
+	"time"
+)
+
+// TestOpen test open file cache
+func TestOpen(t *testing.T) {
+	testFile := start("TestOpen.txt")
+
+	gtest.Case(t, func() {
+		f, err := gfpool.Open(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666)
+		gtest.AssertEQ(err, nil)
+		f.Close()
+
+		f2, err1 := gfpool.Open(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666)
+		gtest.AssertEQ(err1, nil)
+		gtest.AssertEQ(f, f2)
+		f2.Close()
+
+		// Deprecated test
+		f3, err2 := gfpool.OpenFile(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666)
+		gtest.AssertEQ(err2, nil)
+		gtest.AssertEQ(f, f3)
+		f3.Close()
+
+	})
+
+	stop(testFile)
+}
+
+// TestOpenErr test open file error
+func TestOpenErr(t *testing.T) {
+	gtest.Case(t, func() {
+		testErrFile := "errorPath"
+		_, err := gfpool.Open(testErrFile, os.O_RDWR, 0666)
+		gtest.AssertNE(err, nil)
+
+		// delete file error
+		testFile := start("TestOpenDeleteErr.txt")
+		pool := gfpool.New(testFile, os.O_RDWR, 0666)
+		_, err1 := pool.File()
+		gtest.AssertEQ(err1, nil)
+		stop(testFile)
+		_, err1 = pool.File()
+		gtest.AssertNE(err1, nil)
+
+		// append mode delete file error and create again
+		testFile = start("TestOpenCreateErr.txt")
+		pool = gfpool.New(testFile, os.O_CREATE, 0666)
+		_, err1 = pool.File()
+		gtest.AssertEQ(err1, nil)
+		stop(testFile)
+		_, err1 = pool.File()
+		gtest.AssertEQ(err1, nil)
+
+		// append mode delete file error
+		testFile = start("TestOpenAppendErr.txt")
+		pool = gfpool.New(testFile, os.O_APPEND, 0666)
+		_, err1 = pool.File()
+		gtest.AssertEQ(err1, nil)
+		stop(testFile)
+		_, err1 = pool.File()
+		gtest.AssertNE(err1, nil)
+
+		// trunc mode delete file error
+		testFile = start("TestOpenTruncErr.txt")
+		pool = gfpool.New(testFile, os.O_TRUNC, 0666)
+		_, err1 = pool.File()
+		gtest.AssertEQ(err1, nil)
+		stop(testFile)
+		_, err1 = pool.File()
+		glog.Error(err1)
+		gtest.AssertNE(err1, nil)
+	})
+}
+
+// TestOpenExpire test open file cache expire
+func TestOpenExpire(t *testing.T) {
+	testFile := start("TestOpenExpire.txt")
+
+	gtest.Case(t, func() {
+		f, err := gfpool.Open(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666, 100)
+		gtest.AssertEQ(err, nil)
+		f.Close()
+
+		time.Sleep(150 * time.Millisecond)
+		f2, err1 := gfpool.Open(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666, 100)
+		gtest.AssertEQ(err1, nil)
+		gtest.AssertNE(f, f2)
+		f2.Close()
+
+		// Deprecated test
+		f3, err2 := gfpool.Open(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666, 100)
+		gtest.AssertEQ(err2, nil)
+		gtest.AssertEQ(f2, f3)
+		f3.Close()
+	})
+
+	stop(testFile)
+}
+
+// TestNewPool test gfpool new function
+func TestNewPool(t *testing.T) {
+	testFile := start("TestNewPool.txt")
+
+	gtest.Case(t, func() {
+		f, err := gfpool.Open(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666)
+		gtest.AssertEQ(err, nil)
+		f.Close()
+
+		pool := gfpool.New(testFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_APPEND, 0666)
+		f2, err1 := pool.File()
+		// pool not equal
+		gtest.AssertEQ(err1, nil)
+		gtest.AssertNE(f, f2)
+		f2.Close()
+
+		pool.Close()
+	})
+
+	stop(testFile)
+}
+
+// test before
+func start(name string) string {
+	testFile := os.TempDir() + string(os.PathSeparator) + name
+	if gfile.Exists(testFile) {
+		gfile.Remove(testFile)
+	}
+	content := "123"
+	gfile.PutContents(testFile, content)
+	return testFile
+}
+
+// test after
+func stop(testFile string) {
+	if gfile.Exists(testFile) {
+		err := gfile.Remove(testFile)
+		if err != nil {
+			glog.Error(err)
+		}
+	}
+}