According to the present situation which is lack of the rock dredging theory and the construction technology,this paper presents the new revised rock mass basic quality indicator for the dredging engineering ([BQ]TH) and also analyzes the influential factors for the heavy duty cutter suction dredger working in the moderately weathered rock,on the basis of the data recorded in the dredging construction in the medium weathered rock.The results show that the reamer slice thickness,the reamer shaft speed,and reamer power with revised rock mass basic quality indicator ([BQ]TH) have good correlations.Relevant empirical formulas are summarized to guide future process of the construction technology.