Abstract: System simulation is an important way to study the wireless sensor networks.This paper presents a design and implement method of networks simulation system based on MobilityFramework after analyzing and comparing related networks simulation tools.The system adopts layer structure，which can implement the single node layered and define the function behaviors on each layer.In the system，one layer is independent from each other in order to improve the reuse rate of the module code.In addition，it integrates energy-consumption，time-delay，packet-loss models and adopts database as a backstage supporter to strengthen simulation function and capability of storaging and processing experimental data.If providing the configuration file，we can simulate without the platform，which improve the portabillity of simulation examples.Finally，through the simulation experiments，the results show that the system is a good experimental platform for WSNs，which has the feature of modeling fast，effective remodeling，complete function and more reliable experimental data.

Key words: wireless sensor networks, system simulation, MobilityFramework

摘要： 系统仿真是无线传感器网络研究的重要手段。在分析和比较相关网络仿真工具的基础上，给出一种基于MobilityFramework的传感器网络仿真系统的设计和实现方法。该系统采用层结构，以实现单个传感器节点的分层和各层功能行为定义，节点各层的相互独立使模块代码复用率大大提高；功能上该系统集成了传感器网络能耗、时延和丢包统计模型，并采用后台数据库支持技术，增强了仿真实验的数据储存和处理能力；此外，系统也可支持配置文件和仿真文件的脱平台运行，具有很好的可移植性。通过传感器网络系统相关实验模拟，表明该系统建模快、重构有效、功能完整和实验结果真实可靠，是一种适合无线传感器网络的实验平台。

关键词: 无线传感器网络, 系统仿真, MobilityFramework