The utility model discloses a back -up sand gravel material weir dam body is thrown to aquatic, the dam body includes the dam foot in the upper reaches and low reaches, throw between the dam foot and fill out the gravel building stones dam body of formation, gravel building stones dam body includes gravel building stones dam body and the above gravel building stones dam body of the surface of water below the surface of water, the dam crest of the gravel building stones dam body more than the surface of water bores has the multirow to shake to dash and encrypt shaking to dash and encrypting the hole staggered arrangement of hole and close two rows, and every row is shaken to dash and encrypts the hole and shaken to dash by the I th order to encrypt hole and the II th order and shake to dash and encrypt the hole and form in turn. This method adopts to the weir and throws the back -up sand gravel to the aquatic and expects to carry out reasonable cloth hole, pore -creating, shake dashing to the dam body more than the surface of water to encrypt and pack in succession, improves the relative density who throws back -up sand gravel material dam body and is not less than 0.75 of existing pulse constant current embankment dam design specifications regulation to the control dam body warp, guarantees the dam body and stabilizes safety.