Abstract: PV work output from compressor to expander is an important index to evaluate compressor performence.The RC load method can be used to simulate many expanders and simplily the reseach on the matching problem be tween compressor and expander.The RC load test platform is established by connecting the linear compressor with the needle valve and the buffer.The feedback characteristics of linear compressor output acoustic power and power output in a variety of operating conditions are measured,and the test results of different loads were analyzed by voltage balance and force balance.The theoretical calculations are compared with experimental results to provide basis for the matching of compressor and expander.