The present invention relates to a kind of methods of his ecological river submerged weir and a multi-stage construction to be formatted to aquatic organism more specifically submerged weir and be installed in multistage in addition to upstream side in a predetermined space to downstream side, each deep shoal and aquatic life habitat shoulder to shoulder than bed wonjiban at another below submerged weir, in groups from the downstream direction of leader, a zanjon water is formed by even ratio of elongation bed wonjiban, enough depth are provided to Habitat for Fish and barrier and aquatic organism, and river water level or at least reduce be exposed dry season of bed of water of river water shortage of ground and will be fished on the submerged weir river ecology for the multistage that can be format with one of ditch by depth of water and its construction method in groups and maintenance function.
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