An ad hoc mobile network consists of wireless nodes. The communication between mobile nodes is carried in the absence of centralized control and self-configurable network where the mobile nodes move randomly. Here the comparison of three routing protocols i.e. AODV, DSDV and OLSR is done. The simulation tool used is NS-3.17. The performance of these routing protocols is analyzed by four parameters: average end to end delay, normalized routing load, packet delivery ratio and average throughput.