The property,main preparing methods and application of peracetic acid are introduced detailedly.It helps to develop new kinds of peracetic acid and widen the market of peracetic acid.There are many methods for preparing peracetic acid,such as the acetic acid method,the acetaldehyde method and the acetyl-compound method.Peracetic acid is not only a good oxidant,but also a broad-spectrum,low-cost germicide with quick result,which is mainly applied to disinfection,medical treatment,pharmacy,chemical engineering and nom-soil planting.