The biological fiber mask is called the human dermis, is by way of the rigorous fermentation engineering,and the breeding string gives nai mi level organic fiber, it makes the natural fiber, is in the nature the smallest organic fiber, it can let the air and the moisture passes, soft simultaneously has certainly the good toughness, because does not have the characteristic which is repelled by the human body, therefore, is used for in the medical arena to take the cardiovascular repair and the man-made skin use.