Aiming at the problem that the treatment effect of shallow dredger fill mud layer is relatively poor,we analyze the reinforcement mechanism of combination of wide and narrow drainage plates,and apply the method of indoor and field test to compare the physical and mechanical indexes of wide and narrow hot melt drainage plates and the reinforcement effect of single using different width drainage plates.The results show that the reinforcement effect of wide plate is slightly better than narrow plate.The reinforcement effect of combining wide and narrow plates is better than single wide plate in several aspects,such as the dissipation of pore pressure and the vane test shear strength after reinforcement in drainage filling mud layer.The method is economical,which can provide references for the similar projects.