require 'win32ole' #application = WIN32OLE.new('Excel.Application.5') application = WIN32OLE.new('Excel.Application') application.visible = TRUE workbook = application.Workbooks.Add(); sheet = workbook.Worksheets(1); sheetS = workbook.Worksheets puts "The number of sheets is #{sheetS.count}" puts "Now add 2 sheets after of `#{sheet.name}`" sheetS.add({'count'=>2, 'after'=>sheet}) puts "The number of sheets is #{sheetS.count}"