In order to meet the performance requirements of heavy-duty machine tools under heavy load cutting conditions,a kind of rolling and sliding composite guide rail for heavy-duty precision CNC rotary table was designed.The detailed structure,selection calculation and design key points of the guide rail were described,and the problem of mutual restriction between heavy load and precision was solved.The practical application results show that the accuracy of the table and the stability of movement can be improved by using the guideway,which is worth popularizing.