Abstract: This paper presents the dynamic stress tests of the compressor blade in the gas turbine engine in which the compressor stator possesses two kinds of unequal pitch cascades. The effect of these two kinds of stators on the blade vibration is analysed.The obtained results indicate that in comparison with those of the original equal pitch cascade stator the average vibratory stress of the first construction decreases by 30.8%, and that of the second-by 42%. Meanwhile, somemore complex pheNomena also occurred, for example, the frequency of resonant revolutions greatly increases; the beat pheNomena appear in all the vibratory signals of the first construction and so on.In this analysis, the excited force of wake for these stators is expanded by the Fourier series. As a result, the frequency spectrum of excited force agrees very well with that obtained in the tests. The solution of the blade forced vibration equation is investigated, so that the pheNomena appeared in the tests such as dynamic response of the blade and beat can be well explained.