Abstract: This paper presents some important findings found from the researchs on soil liquefaction during the past two decades in the Water Conservancy and Hydroelectric Power Research Institute of China. They are the effect of stress condition on the development of excess pore water pressure in the course of soil liquefaction, the effect of the orientation and arrangement of sand grains upon the stability of the skeleton structure of the sands against vibratory action, the mechanism of development, dissipation and dispersion of pore water pressure in a saturated soil mass commenced by vibratory action, and criteria for evaluating liquefaction potential of silty soils. These topics are receiving more attention now a day in solving the problem of soil liquefaction. The author also tries to deliver his opinion about these problems in this paper.