本文从物理角度分析推土机铲刀自控系统中铲刀强烈振荡的原因，提出消除此种振荡的三种措施，指出其各自的优缺点，详述设计铲刀消振电路的关键环节──建立原始状态图，给出铲刀消振实用电路，此电路的正确性已获得理论及实践的验证。 This paper analyzes the reason of blade strong oscillation in automatic control system of bulldozer blade from the physical point of view, puts forward three measures to eliminate such oscillation, points out their respective advantages and disadvantages, and details the key aspects of designing vibration elimination circuit of blade - State diagram, giving shovel vibration suppression utility circuit, the correctness of this circuit has been verified by theory and practice.