答案：

You can delete the sheets that get created automatically by Excel when you use XLSWRITE with a new file name by using 

ActiveX functionality (Windows only).

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Example:

excelFileName = 'Test.xls';

excelFilePath = pwd; % Current working directory.

sheetName = 'Sheet'; % EN: Sheet, DE: Tabelle, etc. (Lang. dependent)

% Open Excel file.

objExcel = actxserver('Excel.Application');

objExcel.Workbooks.Open(fullfile(excelFilePath, excelFileName)); % Full path is necessary!

% Delete sheets.

try

      % Throws an error if the sheets do not exist.

      objExcel.ActiveWorkbook.Worksheets.Item([sheetName '1']).Delete;

      objExcel.ActiveWorkbook.Worksheets.Item([sheetName '2']).Delete;

      objExcel.ActiveWorkbook.Worksheets.Item([sheetName '3']).Delete;

catch

      ; % Do nothing.

end

% Save, close and clean up.

objExcel.ActiveWorkbook.Save;

objExcel.ActiveWorkbook.Close;

objExcel.Quit;

objExcel.delete;