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In view of the clustering routing protocol currently used in Wireless Sensor Network (WSN), there are problems such as all cluster heads directly communicate with the aggregation nodes, the energy consumption of cluster heads away from the aggregation nodes is too fast, etc. Based on the characteristics of Ant Colony Algorithm (ACA) and the WSN Clustering Routing Algorithm, the ACA is improved and introduced into the WSN clustering routing mechanism, and then a WSN clustering routing algorithm with improved ACA is proposed. The algorithm sets the distance to the aggression node as the heuristic function to find out the best path to cluster sinking and improve the ACA efficiency; at the same time, the residual energy of the node is taken into account at the selection of probability formula for the nodes, and the energy consumption of cluster nodes during data transmission is reduced, so that the node energy is utilized in high efficiency, the service life of the network is enhanced and more efficient network communication is achieved. Through simulation, the results show that the algorithm is feasible and effective.