Relying on the east channel expansion project of Qinzhou Port in Guangxi，this paper investigates the problems，such as difficult excavation，serious wear of cutter teeth and pipes，and easy blockage of pipes during transportation，encountered in the dredging of typical sandstone by the heavy-duty cutter suction dredger “Tiankun” and analyzes the property indexes of dredged sandstone. From the perspective of the correlation of the excavation specific energy of weathered sandstone with the ship construction parameters，the paper derives the calculation formulas for the property indexes，such as saturated uniaxial compressive strength，power consumption of the reamer，and excavation production，of the sandstone in Qinzhou according to excavation construction parameters and the theory of specific energy. These formulas can be used to forecast excavation production during the excavation of weathered rock by a heavy-duty cutter suction dredger and provide technical support for the operation and production of dredging projects.