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Precision agriculture is the frontier of international contemporary agriculture in the twentieth century. The development of precision agriculture is a significant strategic choice of agriculture and agricultural science development in the new stage in China. As a novel technology of information acquisition and processing, WSN possesses a great strategic meaning in overall improving the modernize level of precision agriculture. Routing protocol is an indispensable part which ensures the normal operation of wireless sensor network and the high efficient transmission of information. The existing routing protocols for wireless sensor network are classified in this paper, while comparison and analysis research are also given on route structure, energy consumption, robustness, expansibility, node mobility, data fusion technology, whether QoS is supported and maximizing the network lifecycle of all kinds of routing protocols. At the end of this paper, a simulation research is made with NS2 network simulation software on the dynamic clustering process of LEACH protocols, which is a typical WSN routing protocol. The simulation results show that the random cluster-head selecting method in LEACH protocol cannot ensure the number of cluster heads completely equal to the anticipant optimal one during the dynamic clustering process, and it also exists that the distances between cluster heads are too close or sensors of some regions are too far from their cluster heads. All above these situations cause the decreasing of LEACH protocol's performance.