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In Wireless Sensor Network, Sensor nodes communicate with each other using routing protocols. Whenver sensor nodes move from one location to another location then routing protocols handle mobility of sensor nodes in Wireless sensor network. The Sensor nodes are changes its position with fraction of minute or seconds in Wireless Sensor Network. Sensor nodes have location finding system component that work with routing protocols for movement one location to another location in wireless sensor network. Mobility of sensor nodes can increase energy of sensor nodes in Wireless sensor nodes. In this paper the works focus on the comparison and analysis where routing protocols give the best performance when the mobility of Sensor nodes increase. Here Qualnet 5.0.2 Simulation tool is used for simulation process and comparison of AODV, DSR and Bellman Ford are considered. So in this paper we try to analyze the performance of AODV, DSR and Bellman Ford Routing Protocols under various network topology changes. This result might help to judge that which protocol is efficient with less drop-tail.