In order to improve the Westinghouse Monopulse Secondary Surveillance Radar(MSSR) quality, a method which performed the multi-radar data fusion at first, and converted the fusion tracks into Westinghouse MSSR plot message format was presented. Some key technologies were researched, such as coordinate transforming, plot message format and output controlling. This method was confirmed at Guiyang airport air traffic control central， and the results showed that the Westinghouse radar data quality near the radar site and out of 200 nm were improved.
