This study presents an accurate measurement method for measuring air pressure and temperature of air compressor when a reciprocating gas compressor performance. The design and main functions of the automatic acquisition and testing system for air compressor performance was introduced. The system has the advantages of excellent practicability, rapidity, stability, reliability, operability and good security feature. The system can give real-time process monitoring on test data and compile test reports of the reciprocating two stages compressor. The system can display, save and print performance curve, respectively.