Research and development of heat exchanger CAD system is described in this paper. It is applied to computer aided design of floating head exchanger, floating head condenser, U_tube exchanger and fixed tube plate exchanger. 介绍换热器CAD软件系统的研制开发及其功能,它主要用于浮头式换热器、浮头式冷凝器、U型管式换热器和固定管板式换热器的计算机辅助设计。