1. Effective stimulus of human respiration, which stimulates the external chemoreceptor of human body and stimulates the respiration. If a person inhales pure oxygen for a long time, the concentration of carbon dioxide in the body is too low, which can cause breathing to stop. Thus, a mixture of 5% carbon dioxide and 95% oxygen is clinically applied to the treatment of carbon monoxide poisoning, drowning, shock, alkalosis and anesthesia. Liquid carbon dioxide cryogenic surgery is also widely used.

2. Store grain, fruits and vegetables. The food stored with carbon dioxide can effectively prevent the growth of bacteria, molds and worms in food due to hypoxia and the inhibition of carbon dioxide itself, avoid the generation of spoilage and harmful peroxides, and keep fresh and maintain the original flavor and nutrition of food. Carbon dioxide does not cause drug residues or air pollution in grains. Running carbon dioxide into the rice warehouse for 24 hours kills 99% of the bugs.

3. As extractant. Carbon dioxide is widely used in food and beverage abroad. Oil, perfume, medicine processing and extraction.

4. With carbon dioxide and hydrogen as raw materials, it can produce methanol, methane, methyl ether, polycarbonate and other chemical raw materials and new fuels.

5. As oil field injector. It can effectively drive oil and improve oil recovery rate.

6. The coal seams which are difficult to be mined underground are injected to gasify coal seams and obtain synthetic gases and intermediates needed by chemical industry.

7. The protection arc welding, not only can avoid the metal surface and oxidation, but also can increase the welding speed about 9 times.