It is easy to paste cutter head and to block pipe when the cutter suction dredger is dredging typical cohesive soil,dense silt and calcareous tuberculosis mixed soil.Relying on the 300,000 tons waterway dredging project in Lianyungang Port,we analyze the ununiformity of mixed soil,and derive the calculation formula of characteristic index of mixed soil and dredging volume in Lianyungang Port from the perspective of the correlation between typical soil dredging specific energy and ship construction parameters,which can predict the dredging volume of complex soil.The results show that the typical mixed soil of Lianyungang Port is made up of cohesive soil,dense silt and calcareous tuberculosis,and has various soil characteristics .This soil dredging volume of the“Tianhu”cutter suction dredger is predicted by the derivation formula,and the relative deviation of the predicted value is below 15% compared with the measured value,the reliability is very good.It can provide conferences for the similar projects.