Abstract: This paper describes how to make use of laser holographic interferometry in vibration analysis of aerocraft beam structure models. Various vibration modes for two kinds of simplified models （three-beam and five-beam） of the same wing have been photographed by means of laser holography. Meanwhile, their nature frequencies and node distributions have been obtained from theoretical calculations. The good approximation of both results in comparison demonstrates that they both are reliable.The vibration analysis of three-beam and five-beam models for an aero-craft wing beam construction shows that some difference between both their five-order vibration modes occurs and indicates the rigidity difference of both models. The simplification of the simple three-beam model leads to some errors, and the five-beam model proved to be more trustworthy.