Abstract: In this paper the improved method of judgement matrix and automatically correcting methods were be introduced, which were based on the originally analytic hierarchy process. The identification of complex noise source based on cohere power spectrum analysis and AHP was be presented through the simulation research, and the identification of complex noise source based on partial coherence analysis and AHP was also be researched. The simulation results show that in order to solve the noise source identification problems of multi-source system which has a strong coherence, the noise source level of identification methods based on the partial coherence function is an effective way.