Abstract: To realize an actual network system is always the most costing or unpractical during the research of routing technologies in MANET(mobile Ad Hoc network).Simulating network routing protocols by using Network Simulation version2(NS2) is one of valid and economical research methods. However, current NS2 can not simulate all of routing protocols in MANET. According to the extendable simulation principles and methods of NS2, In this paper, adding routing protocols is studied and an Associativity Based Routing（ABR）is added in NS2.The testing result of data transmission speed shows network simulation of routing protocol ABR by extended NS2 is convenient to users to evaluate the performance of network。

Key words: NS2, MANET, routing protocol, ABR, data transmission speed.

摘要： 在移动自组网路由技术的研究中，实际网络系统的实现往往是代价最高或不现实的;利用网络仿真器NS2对相关路由协议的仿真是一种既有效又经济的研究方法，但目前的NS2还不能支持所有移动自组网路由协议的仿真；根据拓展仿真的原理和方法，对在NS2中添加路由协议进行了研究,添加了基于关联度的路由协议ABR，对节点间数据传输率的测试结果表明利用拓展后的NS2进行ABR协议的网络仿真，能方便用户对网络性能进行评价。

关键词: NS2, 移动自组网, 路由协议, ABR, 数据传输率.