Abstract: In view of the pattern of multiple gas supply in cities, a series of problems about gas interchangeability are brought to our attention. For atmospheric gas burner, integrated gas interchangeability and blending test system has been designed for laboratory research, which includes dynamic gas-mixing system and combustion characteristics of gas appliances testing system. The devices have the advantages of small and accurate multi-gas blending, fast respond speed, instant blending and use, digital display instrument, and continuous gas flowing. Besides, the system has huge advantages in determining the flexible range of gas appliances to different gases. Many problems have been solved perfectly by using this system, such as large space occupation, the unevenness of gas mixture, long time lag, and wasting gas.