Abstract: Considering the effect of balance rope on the tension of the lifting system，the tension differential equation of the wire rope in the ascending process at the wheel is established.On the basis of this，the torsional characteristics of wire rope under dynamic tension are derived.The torsional characteristics such as torsion，maximum torsion angle，torsion angle and rotation number are analyzed，based on the five stage acceleration operation parameters of a kilometer deep mine.The results showed that the maximum torsion angle of wire rope is always in the middle，it is equivalent to the middle of the steel wire rope with rotating force，loose twist is on the upper part of the hoisting rope，unit torsion angle is negative，the lower part is opposite.The conception and reasons of tight twist and loose twist in the running process are explained from the graphics.