提出了一种黄土自重湿陷的机理———地球脉动引起饱和黄土液化，简要地介绍了地球脉动的原理，并从土动力学的角度分析了地球脉动引起饱和黄土液化的过程。通过现场浸水试验、地球脉动的定时测量及室内土工试验等，揭示了脉动的幅值、卓越周期与液化程度的关系。最后还分析了影响脉动液化的因素，结果表明，这些因素都有利于液化的产生，从而导致黄土自重湿陷。 A mechanism of self-weight collapsible loess is proposed, in which liquefaction of saturated loess caused by earth pulsation is briefly introduced. The principle of earth pulsation is briefly introduced and the process of liquefaction of saturated loess caused by earth pulsation is analyzed from the view of soil dynamics. Through the field immersion test, the timing measurement of the earth’s pulsation and the indoor geotechnical test, the relationship between the amplitude of pulsation, the excellent cycle and the degree of liquefaction is revealed. Finally, the factors influencing pulsating liquefaction are also analyzed. The results show that these factors are conducive to the liquefaction, resulting in collapse of loess weight.