The present invention relates in a kind of disposable sanitary product, including melt spun elastic fibers, especially diaper. Moreover, it relates to the preparation method of disposable sanitary product, include the following steps: to provide a kind of melt spun elastic fibers melt spun elastic fibers and to disposable sanitary product or one for manufacturing disposable sanitary product And disposable sanitary product is prepared in preparation process using melt spun elastic fibers.