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In view of the traditional C/S structure of DCS thermal power control system design method of PC to communicate with the server, the server needs to communicate with more than one operator station, the load is too high, in order to solve this problem, design a new generation of DCS data monitoring system based on B/S mode, in point to point mode to complete communication, server relative to each operator station is independent, to overcome the disadvantages of the current communication system at the same time the high load. Gives the key underlying control station information acquisition module and DP bus information transmission module of detailed design and related software design, and gives the detailed design scheme of key of B/S structure. Experimental results show that based on B/S structure of DCS data monitoring system of the measurement error is small, the length of the upper machine communication less than 1 s, redundant server restart switch is not more than 1.2 s, the optimization effect is more obvious. 