The radar structure CAD system includes the system ensemble platform, antenna structure CAD subsystem, antenna pedestal CAD subsystem, enclosure CAD subsystem, shelter CAD subsystem and thermal design subsystem. The organic whole is integrated with these subsystems. At user interface, They keep the relative independence each other. At database, they are managed in a tigthness and unigormity. At function implement, An object-oriented approach is applied. The system consists of classes of objects that interact by sending messages that invoke methods. At design thought, it displays the engineering and professional of radar structure design. These subsystems have based on a system platform, finite clement analysis subsystem and Chinese environment. The repeat content is avoided. The system integration is implemented that all subsystems are in one by tightly on a uniform platform.