The multipath under network environment may cause the fusion node using the past information repeatedlywhich may lead to excessive data fusion and severe estimation bias.To solve the problema distributed information fusion algorithm based on communication connection matrix is presented.The connection matrix for a moment is obtained through the communication topology of the sensor network at that momentthe duplicate priori information is found and eliminated by calculating the connection matrix，and the corresponding distributed information fusion algorithm is established.The simulation results show that this algorithm can eliminate the influence of repeated information in the network to the fusion performance.