Abstract: Electromagnetic compatibility testing of proton therapy system is different from that of traditional products in an anechoic chamber. It has high requirements on the division of sample composition, the understanding of applicable standards, the formulation of operation mode, the selection of test location, and the test of ambient noise. According to the requirements of GB 4824—2019 standard, the test method of radiation emission of proton therapy equipment was developed to provide reference advice for the industry, and the problems encountered in the actual test were studied.