diff --git a/zss.test/src/test/java/org/zkoss/zss/model/importer/ExcelImporterTest.java b/zss.test/src/test/java/org/zkoss/zss/model/importer/ExcelImporterTest.java
new file mode 100644
index 000000000..090dcbe1b
--- /dev/null
+++ b/zss.test/src/test/java/org/zkoss/zss/model/importer/ExcelImporterTest.java
@@ -0,0 +1,104 @@
+package org.zkoss.zss.model.importer;
+
+import static org.junit.Assert.fail;
+
+import java.io.*;
+import java.util.*;
+
+import org.junit.Test;
+import org.zkoss.zss.model.SBook;
+import org.zkoss.zss.range.*;
+import org.zkoss.zss.range.impl.imexp.*;
+import org.zkoss.zss.range.impl.imexp.ExcelExportFactory.Type;
+
+public class ExcelImporterTest {
+
+	static ExcelImportFactory importFactory = new ExcelImportFactory();
+	static 	ExcelExportFactory xlsxExportFactory = new ExcelExportFactory(Type.XLSX);
+	static ExcelExportFactory xlsExportFactory = new ExcelExportFactory(Type.XLS);
+	
+	/**
+	 * Import massive Excel files to ensure the importer and exporter can accept various Excel files without crash.
+	 * procedure:
+	 * 1. import files and export to validate importing.
+	 * 2. import previously exported files to validate exporting. 
+	 */
+	@Test
+	public void importExport(){
+		File SOURCE_PATH = new File("./src/test/java");
+		File EXPORTED_PATH = new File("./target/exported");
+		EXPORTED_PATH.mkdir();
+		
+		List<File> files2Import = new LinkedList<File>();
+		LinkedList<File> folders2Scan = new LinkedList<File>();
+		
+		folders2Scan.add(SOURCE_PATH);
+		//find xls and xlsx file in source path
+		while(folders2Scan.size()>0){
+			File scanningFolder = folders2Scan.removeFirst();
+			File[] path2Check = scanningFolder.listFiles();
+			for (File  path : path2Check){
+				if (path.isDirectory()){
+					folders2Scan.addLast(path);
+				}else{
+					if (path.getName().toLowerCase().endsWith("xls") || path.getName().toLowerCase().endsWith("xlsx")){
+						files2Import.add(path);
+					}
+				}
+			}
+		}
+		
+
+		String workingFile = null;
+		Type[] formats = {Type.XLSX, Type.XLS};
+		for (Type format : formats){
+			String action = null;
+			for (File  file : files2Import){
+				try{
+					//import 
+					action = "Fisrt import";
+					workingFile = file.getCanonicalPath();
+					SBook book = importFactory.createImporter().imports(file, file.getName());
+
+					//export to a specific folder
+					String fileName = getFileName(format, book);
+					action = "Export "+format;
+					getExporter(format).export(book, new File(EXPORTED_PATH.getPath()+File.separator+fileName));
+					
+					action = "Second import";
+					importFactory.createImporter().imports(file, file.getName());
+				}catch (Exception e) {
+//					System.out.println("failed on ["+action+"] "+workingFile);
+					e.printStackTrace();
+					fail("failed on ["+action+"] "+workingFile);
+				}
+			}
+			
+		}
+	}
+	
+	private SExporter getExporter(Type format){
+		if (format == Type.XLSX){
+			return xlsxExportFactory.createExporter();
+		}else{
+			return xlsExportFactory.createExporter();
+		}
+	}
+	
+	private String getFileName(Type format, SBook book){
+		if (format == Type.XLSX){
+			return book.getBookName().endsWith("xls")?book.getBookName()+"x":book.getBookName();
+		}else{
+			return book.getBookName().endsWith("xls")?book.getBookName():book.getBookName().substring(0, book.getBookName().length()-1);
+		}
+	}
+	
+	@Test
+	public void debug() throws IOException{
+//		File file = new File(".\\src\\test\\java\\Book10.xls");
+		File file = new File("./src/test/java/org/zkoss/zss/api/impl/book/280-reapply.xlsx");
+		SBook book = new ExcelImportFactory().createImporter().imports(file, "debug");
+		File EXPORTED_PATH = new File("./target/exported");
+		//getExporter(Type.XLS).export(book, new File(EXPORTED_PATH.getPath()+File.separator+getFileName(Type.XLS, book)));
+	}
+}