The computers used as a good-quality and high-efficiency office equipment has been generalized increasingly.However ,CAD system acting as an advanced tool of scientific research and design is being attached importance to and having a recption gradually.In particular, the development and ripeness of the local network open the good way to the realization of office automation and intellectualization.The author makes an emphatic introduction to the main features.and establishment method of local network and its application in the scientific research engineering institutes,discovers the problems faced in deploying the local network and presents the solving method.