Abstract: This paper presents the test purpose,contents,test apparatus,measurement parameters and test methods for the nuclear Class I motor-operated globe valves.The test results indicate that the valves,seats and stems are airtight without leakage,and opening and closing stroke is 11s under cold state before the test;the valves are opened and closed normally and the opening and closing stroke is 11s in the tests of hot cycle lifetime,hot cycle,heat-cold alternate and flow interruption capability;after the test,the valves and seats are airtight 10 min and 12 water droplets are leaked,the stems are airtight without leakage,and opening and closing stroke is 11s under cold state.All the test data have demonstrated that the valves meet the design requirements.