The Mobile Ad-hoc networks (MANETs) are self-configuring network and each node in MANETs is free to move and has the ability to route packets. However, these characteristics will give rise to Wormhole attack which will increase the influences of network attacks. In recent years, the methods how to avoid wormhole attacks have become attractive research issues. However, many previous works focus on observing the behavior of wormhole node to solve the attack issues. We thought against wormhole attack utilizing the routing characteristics of MANETs will has the better resulting of avoiding attacks. We researched the routing protocol of MANETs, present the wormhole attacks using the weakness of routing protocols and we will propose a robust routing protocol to solve the wormhole attacks.