Transmission conductors icing is a critical threat to the safety of power grid operation. Accurate prediction of the ice shape and growth trend of conductors icing can effectively prevent the occurrence of secondary disasters. Existing models for predicting the ice growth of transmission conductors seldom consider the effect of ice eccentricity torsion on the ice shape of transmission conductors. Therefore， the dynamic torsional icing prediction model of transmission conductor is established by considering the coupling torsional properties of transmission wire， such as ice eccentricity and wind speed. Based on the prediction model， the ice shape on the conductor's surface is simulated and compared with experimental data in the literature， and the validity of the model is verified. The effects of conductor inclination and temperature， wind speed， and MVD （median diameter of raindrops） on ice shape and torsional speed are further discussed with predictive models. It is found that the stratification of the ice thickness on the windward side of the conductor is gradually obvious with the increase of the tilt angle. Compared with the horizontal arrangement （zero inclination） conductor， when the inclination angle is 60°， the ice area of the wire increases by 18.26% （ice covering 125 minutes） and 26.30% （ice covering 245 minutes）， and the torsion angle increases by 10.4° （ice covering 125 minutes） and 16.3° （ice covering 245 minutes）， respectively， and the ice shape is "ravine".