Kn95 respirator is a Chinese substitute for N95 respirator. According to CDC, kn95 respirator has the same effectiveness as N95 and is one of the "suitable substitutes". According to 3m, the world's largest respirator manufacturer, kn95 is "equivalent" to N95 and "very similar in function". Nk95 respirator can effectively resist the virus during the epidemic, which plays an important role in personal protection. Kn95 masks are consumables and necessities, which everyone needs to buy during the period of covid-19. Its audience is all human beings, and the purchase demand is the most of all anti epidemic materials.