Under the Intranet environment of electricity utilization, the substation management information system based on browser/server model and graphics mode is developed by using Java technique.

This paper describes the methods of reading and wristing ofvideo RAM directly in the EGA/VGA graphics mode, and itsapplication in the implementation of saving and restoringgraphis screen, chanese windows, display and zoom of multiplechinese character fonts.

The paper introduces the principle and application of liquid display controller SED1330 newly made by SEIKO EPSON,puts special stress on studying realization of Chinese characters display technology under graphic mode,write the concrete and practical program code,and applies it to display graph and Chinese characters in medical system,its effect is very good.