The movement state and pipe resistance characteristics of broken rock in the discharge pipeline are quite different from other soil properties，and the resistance loss mechanism of rock transportation is complex. Therefore，there is a lack of universal calculation model for rock transportation in the field of dredging. We discuss the motion state of solid particles，the characteristics of resistance loss and the basic theory of resistance model，and analyze the characteristics and applicability of Durand classic resistance model. Based on the transportation data of “Tiankunhao” in Dayaowan，Dalian and a rock dredging project in Russia，we modify and calculate the Durand model，and obtain the modified value of Durand coefficient KD. The results show that the accuracy of pipe resistance calculation is greatly improved，so that the application scope of the model is extended to the rock with particle size less than 100 mm.