Abstract:Reliability is an important attribute to measure the quality of CNC system.The reliability conclusions are drawn according to regular reliability test. At present, for CNC system which MTBF requires a high index of more than 10 000 h, the authentication of MTBF in its implementation is quite difficult, such as long period of time testing. Therefore a set of complete CNC system reliability test program for reference is much-needed. According to correlative standards and product functions of CNC system and reliability test, some principles of reliability test conditions and test programs were given, and the test conditions and test programs were proposed based on the thought reliability compliance test. A typical combined environmental test profile and run test profile were given. The research provides common reference for CNC system reliability test.