diff --git a/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeOverLapTest.java b/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeOverLapTest.java
index 0dfcd51aa2f77..820253f1c6934 100644
--- a/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeOverLapTest.java
+++ b/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeOverLapTest.java
@@ -26,6 +26,7 @@
 import java.io.IOException;
 import java.util.Collections;
 import org.apache.commons.io.FileUtils;
+import org.apache.iotdb.db.conf.IoTDBConstant;
 import org.apache.iotdb.db.engine.fileSystem.SystemFileFactory;
 import org.apache.iotdb.db.engine.merge.manage.MergeResource;
 import org.apache.iotdb.db.engine.merge.task.MergeTask;
@@ -65,26 +66,36 @@ public void tearDown() throws IOException, StorageEngineException {
     FileUtils.deleteDirectory(tempSGDir);
   }
 
+  @Override
   void prepareFiles(int seqFileNum, int unseqFileNum) throws IOException, WriteProcessException {
     for (int i = 0; i < seqFileNum; i++) {
-      File file = SystemFileFactory.INSTANCE.getFile(i + "seq.tsfile");
+      File file = new File(
+          i + "seq" + IoTDBConstant.TSFILE_NAME_SEPARATOR + i + IoTDBConstant.TSFILE_NAME_SEPARATOR
+              + i + IoTDBConstant.TSFILE_NAME_SEPARATOR + 0
+              + ".tsfile");
       TsFileResource tsFileResource = new TsFileResource(file);
       seqResources.add(tsFileResource);
       prepareFile(tsFileResource, i * ptNum, ptNum, 0);
     }
     for (int i = 0; i < unseqFileNum; i++) {
-      File file = SystemFileFactory.INSTANCE.getFile(i + "unseq.tsfile");
+      File file = new File(
+          i + "unseq" + IoTDBConstant.TSFILE_NAME_SEPARATOR + i + IoTDBConstant.TSFILE_NAME_SEPARATOR
+              + i + IoTDBConstant.TSFILE_NAME_SEPARATOR + 0
+              + ".tsfile");
       TsFileResource tsFileResource = new TsFileResource(file);
       unseqResources.add(tsFileResource);
-      prepareFile(tsFileResource, i * ptNum, ptNum * (i + 1) / unseqFileNum, 10000);
+      prepareUnseqFile(tsFileResource, i * ptNum, ptNum * (i + 1) / unseqFileNum, 10000);
     }
-    File file = SystemFileFactory.INSTANCE.getFile(unseqFileNum + "unseq.tsfile");
+    File file = new File(
+        unseqFileNum + "unseq" + IoTDBConstant.TSFILE_NAME_SEPARATOR + unseqFileNum
+            + IoTDBConstant.TSFILE_NAME_SEPARATOR + unseqFileNum + IoTDBConstant.TSFILE_NAME_SEPARATOR + 0
+            + ".tsfile");
     TsFileResource tsFileResource = new TsFileResource(file);
     unseqResources.add(tsFileResource);
     prepareUnseqFile(tsFileResource, 0, ptNum * unseqFileNum, 20000);
   }
 
-  void prepareUnseqFile(TsFileResource tsFileResource, long timeOffset, long ptNum,
+  private void prepareUnseqFile(TsFileResource tsFileResource, long timeOffset, long ptNum,
       long valueOffset)
       throws IOException, WriteProcessException {
     TsFileWriter fileWriter = new TsFileWriter(tsFileResource.getFile());
diff --git a/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeTest.java b/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeTest.java
index b9e809e34aeb9..fb9981c91a7c2 100644
--- a/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeTest.java
+++ b/server/src/test/java/org/apache/iotdb/db/engine/merge/MergeTest.java
@@ -114,12 +114,12 @@ private void prepareSeries() throws MetadataErrorException, PathErrorException {
     }
   }
 
-  private void prepareFiles(int seqFileNum, int unseqFileNum)
+  void prepareFiles(int seqFileNum, int unseqFileNum)
       throws IOException, WriteProcessException {
     for (int i = 0; i < seqFileNum; i++) {
       File file = new File(
           i + "seq" + IoTDBConstant.TSFILE_NAME_SEPARATOR + i + IoTDBConstant.TSFILE_NAME_SEPARATOR
-              + i
+              + i + IoTDBConstant.TSFILE_NAME_SEPARATOR + 0
               + ".tsfile");
       TsFileResource tsFileResource = new TsFileResource(file);
       seqResources.add(tsFileResource);
@@ -129,14 +129,14 @@ private void prepareFiles(int seqFileNum, int unseqFileNum)
       File file = new File(
           i + "unseq" + IoTDBConstant.TSFILE_NAME_SEPARATOR
               + i + IoTDBConstant.TSFILE_NAME_SEPARATOR
-              + i
+              + i + IoTDBConstant.TSFILE_NAME_SEPARATOR + 0
               + ".tsfile");
       TsFileResource tsFileResource = new TsFileResource(file);
       unseqResources.add(tsFileResource);
       prepareFile(tsFileResource, i * ptNum, ptNum * (i + 1) / unseqFileNum, 10000);
     }
     File file = new File(unseqFileNum + "unseq" + IoTDBConstant.TSFILE_NAME_SEPARATOR + unseqFileNum
-        + IoTDBConstant.TSFILE_NAME_SEPARATOR + unseqFileNum + ".tsfile");
+        + IoTDBConstant.TSFILE_NAME_SEPARATOR + unseqFileNum + IoTDBConstant.TSFILE_NAME_SEPARATOR + 0 + ".tsfile");
     TsFileResource tsFileResource = new TsFileResource(file);
     unseqResources.add(tsFileResource);
     prepareFile(tsFileResource, 0, ptNum * unseqFileNum, 20000);