Abstract: In order to overcome the shortcoming of frequent clustering and "One hop communication" between cluster header node and base station in Leach-c protocol,this paper proposed an Ileach-c (Improved low energy adaptive clustering hierarchy-centralized) protocol through analyzing and simulating the previous Leach-c routing protocol.The protocol combine fixed clustering approach and non-fixed clustering approach when it cluster.On the other hand,it achieve that cluster head node can be more hops communication in shortest path with base station by using Dijkstra algorithm.All cluster heads send messages to base station via shortest path by hops communication.The experimental results show that Ileach-c protocol is better than Leach-c protocol in reducing the network transmission cost and prolong the life of wireless sensor network and getting more balanced energy load.