It is important for the NC system parameters to help the NC machine work normally.The NC system parameters must backup,because these parameters are saved by the battery and might be lost after the NC machine turned off.In the process of designing backup software,parameters of the NC system and the realization methods of software need to be given careful consideration.The software can receive the data from machine tools by MScomm control.Through the modification of the communication parameters items,the software can also work on FANUC NC system and other NC systems with same communication protocols,which greatly increases the software's commonality.