根据地铁线路的特点，给出了地铁无线调度通信系统的组成，并对基于摩托罗拉的TETRA(陆地集群无线电) 系统应用做出了具体设计，包括系统结构设计、隧道场强覆盖方式的设计、射频信号放大方式的设计。重点介绍了基于IP的TETRA(DIMETRA IP)系统应用的设计，结合实际给出了可靠性设计的具体方案。为了更好的适应地铁通信系统发展，实现对DIMETRA IP系统的二次开发，本文着重介绍CAD服务器的二次开发，使其真正满足地铁用户的需求。 　　Abstract: 　　According to the characteristics of subway lines， this article introduced the composition of subway wireless dispatching communication system， and the design based on TETRA system was provided，which included system architecture design， tunnel field coverage design， as well as the design of RF signal amplification. This article mainly introduced the design of DIMETRA IP system application. In order to better adapt to the subway communication system development， DIMETRA IP system realized to the secondary development. This paper mainly introduced the second development of CAD server， and make it truly satisfy subway needs of users.