The invention discloses a novel application of 
sodium sulfite (Na2SO3), that is, an application in preparing medicines, health products, functional drinks or 
functional food for preventing hypoxia-induced injury and / or diseases related to 
ischemia-hypoxia. According to the invention, by using Na2SO3 as an 
active component in preparing medicines, health products, functional drinks or 
functional food for preventing hypoxia-induced injury and / or diseases related to 
ischemia-hypoxia, the body can be in a hypoxia (such as 
high altitude hypoxia, mine hypoxia, and the like ) preconditioning state, thus the purpose of preventing hypoxia-induced injury and / or diseases related to 
ischemia-hypoxia (such as high altitude 
pulmonary edema, high altitude 
cerebral edema, cerebral ischemia, 
cardiac ischemia, 
respiratory distress, and the like) can be achieved. The medicines disclosed herein have the following advantages: 1) obvious 
curative effect; 2) no toxic and 
side effect, and high safety; 3) low price of Na2SO3; and 4) convenience in 
drug use (convenience in carrying and taking).