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Read from the DCS simulator through the OPC interface real-time flow rate Q and import and export pressure P i, P o; obtained by processing the abscissa flow rate of the working point Q and the vertical pressure difference P. static curve. Get the surge protection curve and economic work area by reading the text form. Data for surge protection curves and economic work areas are provided by thermal power plants and are written to the system in TXT text. Different pumps can read different texts, get the corresponding surge protection curve and economic work area. Monitoring interface. According to the obtained real-time data, the current working point is marked on the static characteristic curve. Because there are some errors in the data, the system reads the latest 20 sets of data and then obtains a set of data obtained from the average thereof as the current work Point dynamic display in the monitoring interface. Call the police. If the current working point into the surge protection curve on the left, said the current working point in the surge region, the alarm; if the current working point is not within the economic work area, then remind the operator to adjust the position of the water supply spoon It enters the economic work area. Since the system is part of a typical fault diagnosis system for the entire thermal power plant, the alarm interface has been integrated into the fault diagnosis system. System Features Versatility. Different feed pumps can be based on the input characteristics of parameters, get the corresponding characteristic curve and display. real-time. Get real-time data from the DCS simulator to get the current pump operating point. Intuitive. It can directly see from the characteristic curve whether the current working point is in the non-surge area and the economic work area. Economic. Set the economic work area of ​​the water pump, when the work point is not in the economic work area, to remind the user to make the appropriate adjustments, so that the feed pump is always working in an economical state. Example of System Use one of the DCS simulator pumps as an example to introduce the operation of the system. First read the import and export pressure and flow from the DCS simulator, just read the data corresponding to the bit number can get the data. Then set the pump, select the import and export pressure and flow of the bit number, in the SURGE CURV E and OT HER CURVE options were recorded to record the surge protection curve and economic work area text. Conclusion Simulation study of anti-surge system for feed water pump in thermal power plant proves that the software of protection system is embedded in the typical fault diagnosis system of thermal power plant, which has the advantages of sharing, monitoring and protection coordination and saving investment. The flexibility of system operation, the convenience of modification and the visibility of commissioning effect can all meet the actual needs of the site.