Three kinds of imported and domestic sinter brake pads which had been used a lot were tested in contrast, and the average measured friction coefficient was analytical investigated. It was found that brake pressure, initial brake speed and temperature had influence on the friction coefficient of the brake pad. According to the research results, the stability of friction coefficient at low pressure, low speed and high temperature could be evaluated when the quality of brake pads need to be evaluated. Pad A was selected to be mounted at cars, and after the in-service test of 600,000 km, it didn’t appear any hot spots, scratches, thermal cracks and other bad phenomena on the brake disc friction surfaces, and the brake pad was in good condition without block dropping anomalies, which proved that the brake pads could meet the requirements of the 250 km/h EMU. The research results can provide a reference for the revision of the brake pad standards.