Abstract: In the face of increasingly severe energy shortage and environmental degradation, hydrogen energy, as a green, efficient, sustainable and flexible secondary energy, has been widely studied. Depends on power to gas technology in Europe, hydrogen by electrolyzing from renewable energy will be blended into natural gas, which is considered to be one of the effective ways to improve the quality of the gas and the fume emission. Therefore, based on the gas interchangeability theory, the hydrogen proportion is determined, and the safety and emission performance of natural gas mixed with hydrogen on domestic gas appliances is tested based on 12T reference natural gas. The results show that: (1) the ratio of hydrogen could not be higher than 20%; (2) the ignition rate, the flame stability and the fume emission performance of natural gas blended with hydrogen on domestic gas appliances are all qualified, and no safety problems are found; (3) the fume emission of domestic gas appliances all meets the standard requirements, and the CO and NO_x content faces a downward trend with the hydrogen increasing.