As a very important part of the construction process,the dredging project cost directly affects the quality of the project.In recent years,as the dredging project moves towards inland lakes and rivers,the requirements for environmental protection dredging gradually increase.The project cost also needs to change according to the local conditions to avoid the calculation error,which is very beneficial to improve the economic benefit of the project.Taking the inner lake environmental protection dredging project as an example,according to the relevant design scheme and the specific construction conditions of the construction area,we put forward the problems that should be avoided,modify the dredging quota and formulates the project cost,and strive to reduce the error and improve the accuracy of project cost.