diff --git a/tests/unittests/backup_utils/b_filesystem/b_dir_test.cpp b/tests/unittests/backup_utils/b_filesystem/b_dir_test.cpp
index f89595510d083390afd03c5fb04b736597362cc3..4ff46d4054f4301a983dce2b0f09b6ea31a3178e 100644
--- a/tests/unittests/backup_utils/b_filesystem/b_dir_test.cpp
+++ b/tests/unittests/backup_utils/b_filesystem/b_dir_test.cpp
@@ -76,6 +76,45 @@ HWTEST_F(BDirTest, b_dir_GetDirFiles_0100, testing::ext::TestSize.Level0)
     GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetDirFiles_0100";
 }
 
+/**
+ * @tc.number: SUB_backup_b_dir_GetDirFiles_0104
+ * @tc.name: b_dir_GetDirFiles_0104
+ * @tc.desc: Test function of GetDirFiles interface for SUCCESS.
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 0
+ * @tc.require: I6F3GV
+ */
+HWTEST_F(BDirTest, b_dir_GetDirFiles_0104, testing::ext::TestSize.Level0)
+{
+    GTEST_LOG_(INFO) << "BDirTest-begin b_dir_GetDirFiles_0104";
+    try {
+        TestManager tm("b_dir_GetDirFiles_0104");
+
+        string preparedDir = "/data/app/";
+        string touchFilePrefix = string("touch ") + preparedDir;
+        system(touchFilePrefix.append("a.txt").c_str());
+        system(touchFilePrefix.append("b.txt").c_str());
+        system(touchFilePrefix.append("c.txt").c_str());
+
+        bool bSucc;
+        vector<string> out;
+        tie(bSucc, out) = BDir::GetDirFiles(preparedDir);
+
+        vector<string> expectedRes = {preparedDir.append("a.txt"), preparedDir.append("b.txt"),
+                                      preparedDir.append("c.txt")};
+        EXPECT_EQ(out, expectedRes);
+
+        tie(bSucc, out) = BDir::GetDirFiles("dev");
+        EXPECT_EQ(bSucc, true);
+    } catch (...) {
+        EXPECT_TRUE(false);
+        GTEST_LOG_(INFO) << "BDirTest-an exception occurred.";
+    }
+    GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetDirFiles_0104";
+}
+
+
 /**
  * @tc.number: SUB_backup_b_dir_GetBigFiles_0100
  * @tc.name: b_dir_GetBigFiles_0100
@@ -139,6 +178,105 @@ HWTEST_F(BDirTest, b_dir_GetBigFiles_0200, testing::ext::TestSize.Level1)
     GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetBigFiles_0200";
 }
 
+/**
+ * @tc.number: SUB_backup_b_dir_GetBigFiles_0201
+ * @tc.name: b_dir_GetBigFiles_0201
+ * @tc.desc: 测试GetBigFiles接口 分支逻辑
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ * @tc.require: I6F3GV
+ */
+HWTEST_F(BDirTest, b_dir_GetBigFiles_0201, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "BDirTest-begin b_dir_GetBigFiles_0201";
+    try {
+        vector<string> includes = {"/data/"};
+        vector<string> excludes;
+        auto [errCode, mpNameToStat, smallFiles] = BDir::GetBigFiles(includes, excludes);
+        EXPECT_EQ(errCode, ERR_OK);
+    } catch (...) {
+        EXPECT_TRUE(false);
+        GTEST_LOG_(INFO) << "BDirTest-an exception occurred.";
+    }
+    GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetBigFiles_0201";
+}
+
+/**
+ * @tc.number: SUB_backup_b_dir_GetBigFiles_0202
+ * @tc.name: b_dir_GetBigFiles_0202
+ * @tc.desc: 测试GetBigFiles接口 分支逻辑
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ * @tc.require: I6F3GV
+ */
+HWTEST_F(BDirTest, b_dir_GetBigFiles_0202, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "BDirTest-begin b_dir_GetBigFiles_0202";
+    try {
+        vector<string> includes = {"/data/app/"};
+        vector<string> excludes;
+        auto [errCode, mpNameToStat, smallFiles] = BDir::GetBigFiles(includes, excludes);
+        EXPECT_EQ(errCode, ERR_OK);
+    } catch (...) {
+        EXPECT_TRUE(false);
+        GTEST_LOG_(INFO) << "BDirTest-an exception occurred.";
+    }
+    GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetBigFiles_0202";
+}
+
+/**
+ * @tc.number: SUB_backup_b_dir_GetBigFiles_0203
+ * @tc.name: b_dir_GetBigFiles_0203
+ * @tc.desc: 测试GetBigFiles接口 分支逻辑
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ * @tc.require: I6F3GV
+ */
+HWTEST_F(BDirTest, b_dir_GetBigFiles_0203, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "BDirTest-begin b_dir_GetBigFiles_0203";
+    try {
+        vector<string> includes;
+        vector<string> excludes;
+        const string str = "";
+        auto [errCode, mpNameToStat, smallFiles] = BDir::GetBigFiles(includes, excludes);
+        EXPECT_EQ(errCode, ERR_OK);
+    } catch (...) {
+        EXPECT_TRUE(false);
+        GTEST_LOG_(INFO) << "BDirTest-an exception occurred.";
+    }
+    GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetBigFiles_0203";
+}
+
+// /**
+//  * @tc.number: SUB_backup_b_dir_GetBigFiles_0204
+//  * @tc.name: b_dir_GetBigFiles_0204
+//  * @tc.desc: 测试GetBigFiles接口 分支逻辑
+//  * @tc.size: MEDIUM
+//  * @tc.type: FUNC
+//  * @tc.level Level 1
+//  * @tc.require: I6F3GV
+//  */
+// HWTEST_F(BDirTest, b_dir_GetBigFiles_0204, testing::ext::TestSize.Level1)
+// {
+//     GTEST_LOG_(INFO) << "BDirTest-begin b_dir_GetBigFiles_0204";
+//     try {
+//         vector<string> includes;
+//         vector<string> excludes;
+//         const string item = "app";
+//         const string str = "app";
+//         auto [errCode, mpNameToStat, smallFiles] = BDir::GetBigFiles(includes, excludes);
+//         EXPECT_EQ(errCode, ERR_OK);
+//     } catch (...) {
+//         EXPECT_TRUE(false);
+//         GTEST_LOG_(INFO) << "BDirTest-an exception occurred.";
+//     }
+//     GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetBigFiles_0204";
+// }
+
 /**
  * @tc.number: SUB_backup_b_dir_GetBigFiles_0300
  * @tc.name: b_dir_GetBigFiles_0300
@@ -179,4 +317,34 @@ HWTEST_F(BDirTest, b_dir_GetBigFiles_0300, testing::ext::TestSize.Level1)
     }
     GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetBigFiles_0300";
 }
+
+/**
+ * @tc.number: SUB_backup_b_dir_GetDirs_0100
+ * @tc.name: b_dir_GetDirs_0100
+ * @tc.desc: Test function of GetDirs interface for SUCCESS
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ * @tc.require: I6F3GV
+ */
+HWTEST_F(BDirTest, b_dir_GetDirs_0100, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "BDirTest-begin b_dir_GetDirs_0100";
+    try {
+        TestManager tm("b_dir_GetDirs_0100");
+        vector<string_view> paths;
+        vector<string> res = BDir::GetDirs(paths);
+        set<string> inc(paths.begin(), paths.end());
+        bool result = equal(inc.begin(), inc.end(), res.begin(), res.end());
+        EXPECT_EQ(1, result);
+        EXPECT_EQ(inc.size(), res.size());
+    } catch (...) {
+        GTEST_LOG_(INFO) << "BDirTest-an exception occurred.";
+    }
+    GTEST_LOG_(INFO) << "BDirTest-end b_dir_GetDirs_0100";
+}
+
+
+
+
 } // namespace OHOS::FileManagement::Backup
\ No newline at end of file
diff --git a/tests/unittests/backup_utils/b_filesystem/b_file_test.cpp b/tests/unittests/backup_utils/b_filesystem/b_file_test.cpp
index 813e72c0cb6d86ca7e5dc59893438d0d0f4b8224..5708ff7609b0b37bc75733df4221582e7be14dc4 100644
--- a/tests/unittests/backup_utils/b_filesystem/b_file_test.cpp
+++ b/tests/unittests/backup_utils/b_filesystem/b_file_test.cpp
@@ -133,4 +133,31 @@ HWTEST_F(BFileTest, b_file_CopyFile_0100, testing::ext::TestSize.Level1)
     }
     GTEST_LOG_(INFO) << "BFileTest-end b_file_CopyFile_0100";
 }
+
+/**
+ * @tc.number: SUB_backup_b_file_Write_0100
+ * @tc.name: b_file_Write_0100
+ * @tc.desc: 测试Write接口
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ * @tc.require: I6F3GV
+ */
+HWTEST_F(BFileTest, b_file_Write_0100, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "BFileTest-begin b_file_Write_0100";
+    try {
+        TestManager tm(__func__);
+        const auto [filePath, content] = GetTestFile(tm);
+        TestManager tmInFile("b_file_GetFd_0200");
+        string fileInPath = tmInFile.GetRootDirCurTest().append("1.txt");
+        BFile::Write(UniqueFd(open(filePath.data(), O_RDWR)), fileInPath);
+        string contentTmp = BFile::ReadFile(UniqueFd(open(fileInPath.c_str(), O_RDONLY))).get();
+        EXPECT_EQ(contentTmp, fileInPath);
+    } catch (const exception &e) {
+        GTEST_LOG_(INFO) << "BFileTest-an exception occurred by Write.";
+        e.what();
+    }
+    GTEST_LOG_(INFO) << "BFileTest-end b_file_Write_0100";
+}
 } // namespace OHOS::FileManagement::Backup
\ No newline at end of file