Abstract: A WSN is a specialized wireless network made up of a large number of sensors and at least one base station. Sensor Network are emerging as a new tool for important application in diverse fields like military surveillance, habitat monitoring, weather, home electrical appliances and others. Technically, sensor network nodes are limited in respect to energy supply, computational capacity and communication bandwidth. In order to prolong the lifetime of the sensor nodes, designing efficient routing protocol is very critical. Here, we illustrate the existing routing protocol for wireless sensor network in data centric approach. In this review article, we discuss the architecture of wireless sensor networks. Further, we categorize the routing protocols according to some key factors and summarize their mode of operation. Finally, we provide a evaluation of energy consumption graph of SPIN and comparative study on these two main protocols.