Mud concentration is the key parameter of the construction output of cutter suction dredger,and the traditional measurement technology produces nuclear radiation risk and environmental pollution problems due to the use of radioactive sources.Using electric resistance tomography (ERT)technology in electrical tomography technology to conduct concentration distribution imaging of mud pipes,and using electrical conductivity to measure mud concentration,a new set of non-radioactive source measurement device for mud concentration is developed,and the application test of the device in the cutter suction dredger is carried out.The results show that the error between the new mud concentration measuring device and the sampling results is within 3%;compared with the traditional radioactive source measuring device,the reliability is improved and the environmental performance is more prominent.