Mobile adhoc hoc networks are a new class of infrastructureless computer networks without the use of access points instead nodes acts as access points for data communications.Optimised Link State Routing is a table driven routing protocol designed for mobile adhoc networks.In this book OLSR routing measurement performance analysis based on different simulation parameters is done with the help of NS-2 tool.An environment of small network with 5,10,15,20,25,30 nodes is created and the complexity of the network was observed.With the increase in the number of the nodes, the number of sent and delivered packets changes and which changes output and average end to end delay.OLSR is best suited for high mobility environments.