Abstract: In order to make the frequency design requirements of vibration test fixtures more consistent with the engineering practice, the traditional design requirements are compared with the real cases based on the theory of random vibration in this paper. It is shown that the traditional design requirements are defective in three aspects. Firstly, the mass and the stiffness of the testing object are not considered. Secondly, the boundary conditions between the fixtures and the shakers are ignored. Finally, the relationships between the driving direction and the models are not well accounted. The new design requirements of the resonance frequency of test fixtures are proposed. Two missile fixtures are designed according to the traditional design requirements and the new design requirements, respectively. The design results show that the resonance frequency of the fixture designed according to the new design requirements is higher, and its mass is lower.