Abstract: The on line graphics system has been developed with Chinese text based on SIEMENS’SIGMASYS. The main work are data interface, drawing software, real time processing and operating system. The data interface implements communication between SIGMASYS and computer, at the same time, it can receive data, select effective data and return response signals. Drawing software is used for protracting the fire protection architecture plan, it can draw smoke detector, heat detector, fire alarm callpoint, transponder, graphical symbols and so on. Real time processing and operating system completes data collection, fire alarm control, displays the information of fault and linkage, records and prints the information. The system operation provides pull down manus. All of the function blocks are kicked by mouse, in easy and straightforward manner, based on Chinese display environment, beautiful interface, simple and reliable operation.