Geotextile tube bag (Geotube) is one kind of bag with pipe shape, woven with polypropylene yarn with filter structure, the principle of action is in the process of underwater dredging will be polymer flocculant a certain proportion of the solution into the mud, fully mixed into the geotube bag, after pressure filtration dehydration and consolidation, so as to reduce the volume of sludge and solidifying effect.