This paper introduces the refrigeration capacity control test of 1 to 2 frequency separation air-condition, adjusting compressor speed, electronic expansion valve and refrigerant charge to get the best refrigeration capacity. Find out the important control parameters that affect the refrigeration capacity of the air-conditioner, and improve the design of high efficiency air-conditioner Methods and procedures are important tasks to shorten the cooling time and to enable the commercial performance of air conditioners to meet the national energy efficiency standards.