With the rapid development of China's aviation industry,the quality requirements for aviation bearings are getting higher and higher.In order to ensure the safety of helicopter flight,before the helicopter transmission system bearings are installed from the factory,it is necessary to simulate test.By analyzing the specifications and operation conditions of helicopter transmission system bearings and combining the working environment,the overall design of the testing machine and the design of each system were carried out,and finally a helicopter transmission system bearing testing machine was developed.The testing machine could simulate the actual operation of the helicopter in terms of speed,load,temperature and lubrication.And high temperature,oil cut off and durability tests were conducted on the helicopter transmission system bearings,which finally met the requirements of the test and ensured the quality of the bearings.