Abstract:LHDcan run autonomously, which relies oncontrol instructions to adjust the travelling directionsduring travelling process.The Steering action of LHD is nonlinear although the output value of the controller is linear. When the output value is too low, the LHD can’t change the travelling directions autonomously. This phenomenon is called the dead-zone.This paper highlighted the key challenges in dead-zone. Control algorithm can be optimized by the study on dead-zone.Theoretical analysis and experimental tests of the dead-zone were used to optimize control algorithm. The result of experiment indicated that the optimized control algorithm can reduce the dead-zone detrimental effects and improve control effect of running autonomously.