When the cutter suction dredger has a short delivery distance,it will cause the driver (diesel engine or motor)to overload and affect the stability of the system.Although it can be alleviated by reducing the speed and installing necking,it will reduce the economics of system operation.This paper uses theoretical analysis to design the initial shape of a small impeller,calculates its performance through numerical simulation,and iteratively optimizes the final design of the small impeller.The difference between the optimized impeller and the small impeller directly using the cutting diameter is compared.The actual performance of the small impeller in clean water is tested on the actual ship,and the results of the hydraulic design are verified to be reliable.Finally,the construction parameters of the short-row dredging project using the original impeller and the small impeller for the cutter suction ship are compared.After field tests and dredging applications,it is found that the construction efficiency of the small impeller is significantly higher than that of the original impeller under short-row conditions,and the developed small impeller has achieved the design purpose.