There is a great social demand for diapers for infants, feminine sanitary napkins and diapers for adults. Due to the special uses of these sanitary products, there are high requirements for their air permeability and anti-leakage properties. The bottom film of hygienic diapers commonly used in the market is PE cast film. PE cast film is economical and has good anti-leakage effect, but its air permeability is poor. After long-term use, babies will have red buttocks and even eczema. It is comfortable for adults to use. The sensory experience is also very poor. In order to solve the problems raised in the above-mentioned background technology, Wang Xiaochun proposed a backsheet diaper with strong air permeability.