We take the construction project of the extension section of the 100，000-ton level channel in Ganyu Port area of Lianyungang Port（HD-SG-2 bid section）as an example，aim at the problem of grade 4 and 5 clay mixed ginger stones when cutter suction dredger is working in long blowing distance（standard length of shore pipe is 7 km），analyze from the two aspects of excavation technology and transportation technology，use automatic dredging technology in the working conditions of clay mixed ginger stones in terms of construction parameters optimization，realize the optimal construction parameters combination of automatic dredging technology by the comparative analysis of multiple groups of parameters，and revise the construction flow rate and mud density calculation model and the Durand hydraulic gradient calculation model based on the automatic dredging data. The results show that the successful implementation of this technology can improve the calculation accuracy of the productivity of clay transported by the long distance of ultra large cutter suction dredger，determine the optimal combination of construction parameters of this kind of soil，ensure the stability of soil transportation in the pipeline，and avoid pipe blockage.