According to the analysis of Chinese national standard fourway valve in the heat pump system,a new unit has been developed,which can test the lifetime of fourway valve with refrigerant to replace the customarily used nitrogen,and to simulate the real working environment.All the work done includes providing a system solution of test environment,designing control and electric units,developing related software,and carrying out the test for the lifetime of four-way valve.The results indicate that using refrigerant to simulate the real working environment can get the accurate lifetime of four-way valve.