Aiming to solving the problem that multi heterogeneous sources information under different frames can’t fuse effectively in the domain of recognition fusion, a recognition fusion method of multi heterogeneous knowledge based on the condition evidential network is proposed. The method combins domain knowledge of multi heterogeneous sources in cooperative combat under different frames into the frame of evidential networks, and forms the recognition fusion model of multi heterogeneous knowledge. The recognition results can be obtained by the fusion and inference of uncertain evidence information of multi heterogeneous sources. The simulation instance verifies the superiority of the proposed method.