Abstract: Based on the frequency superposition theory calculation method, a forecast method of flutter frequency is established and verified by the following two models:1) The first group of models are a homogeneous trapezoidal plate with a sweep angle as a single variable. A chatter frequency calculation method is proposed, the correlation between flutter modes and bending-torsional coupling modes under different sweep angles is discussed, and the results' accuracy is identified. 2) The second group models are a rectangular cantilever plate with a single layer orientation as a single variable, the flutter parameters regularity is developed, and the chatter frequency of a composite sheet is examined. This method provides a reference for the composite wing design and internal mechanism of chatter problems.