The checking works of dredging monitoring systems of trailing suction hopper dredgers and cutter suction dredgers are closely related to the construction production.To improve the accuracy and rationality of the checking work of dredging monitoring system for dredger,the principle and calibration method of partial no trace ability construction equipment for trailing suction hopper dredgers and cutter suction dredgers are analyzed,such as the principles and checking methods for the cutter depth,for the lowering depth of drag arm.The main construction equipments of the dredgers are also analyzesd,such as the principle and calibration method of densimeter and flowmeter.The working experience from practice is combined to verify the feasibility of the adjusted method after the verification of key construction equipment,along with the reliability of verifying results.The methods for improving the quality and efficiency of the calibration work of the two types of dredgers are obtained.By improving the quality and efficiency of the checking work,construction accuracy and production efficiency are improved,and the dredging project can be completed more quickly and more smoothly.