Abstract: Aiming at the problem that high frequency and high stiffness test pieces are difficult to generate high cycle cracks on the common vibration table, and thus the high cycle fatigue limit cannot be determined, through demonstrating the influence mechanism of fixture mode on the vibration test, a vibration test fixture with adjustable natural frequency is designed and formed. The results show that the fixture is used in vibration test, which suppresses the fixture mode that is not conducive to vibration of the test piece, increases the transmission of beneficial vibration of the test piece, makes up for the problem of insufficient vibration acceleration of the vibration table, and provides an alternative solution for the vibration test of high stiffness and high frequency test pieces.