Since alarm frequently reported signal analysis of power grid can effectively find strong associated influence factors of the frequently reported signal and devices that probably generate frequently reported signals,a method of alarm frequently reported signal analysis based on Weighted Frequent Pattern is proposed.Firstly,Analytic Hierarchy Process (AHP) is used to calculate the weight of each influence factor.And then Doing research on frequent pattern mining and weighted improved FP-growth algorithm is presented.Finally,weighted frequent pattern applied into alarm frequently reported signal analysis that can dig out the frequent item which can highlight significant factors.The example illustrates the feasibility of this method.