Abstract: A type of nuclear class 1 gate valve was tested in the end-loading qualification test. The test intends, test content, test device, test method and results were described in this paper. By performing the force loading on the pipe flange of the valve, the force and stress of the valve was tested. The rigidity, intensity and the functionality of the valve was examined during and after this end-loading qualification test. The test results show that the integrity and operability of this gate valve satisfy the requirement of related documents.