Using the Huazhong 8 numerical control system as the development platform,and taking the level difference grinding process as the research object,the level difference grinding software system was developed.GUI applications were developed by the software under the cross-platform development framework of Qt Creator.Based on the secondary development architecture of Huazhong HNC808D CNC system,API interface was used to develop software functions.The machining macro program was generated in the form of small line segments,using the tap as the carrier,the level difference precision grinding was realized.The results show that the machining accuracy of the software meets the actual demand,the processing efficiency is increased,which provides a set of domestic system application example in the field of level difference grinding.