Abstract: Based on the research of aeroengine performance parameters relativity,an aeroengine performance parameters forecasting method was proposed using multiple linear regression model,in which the effect of multiple factors on dependent was considered.Some aeroengine performance parameters,such as p_4.95,N₂,T₃,N₁,p_B,were analyzed before forecasting of EGT series.At last,the proposed model was verified through some types of aircraft aeroengine performance parameters data obtained from flight experiment,and then compared with adding-weight one-rank local-region method.The result shows that the proposed model has a better forecast accuracy.It can be used as a supporting model in the decision-making of this aeroengine fault forecast.