Abstract: In this study, through the NIM language recompiled by the C language, using the programming operation of the graphics card, a data real-time monitoring system is established and put into use on the 7 sets of instrument built during the China's 15th Five-Year Plan at Chengde central seismic station. The system take the first data of 12 hours as a coordinate origin making real-time coordinate conversion, and rendering 12 hours of raw data real-time curve, and then realizes data real-time monitoring for attendant to view at any time.