Abstract: In view of the differences between microscopic and macroscopic liquefaction of soils, and many unsolved problems in taking undisturbed sand samples, running laboratory testings etc., the author tries to explore some new ways for evaluating liquefaction potential by macroscopic approach to the occurance criteria and development of soil liquefaction. This paper presents some results of such work which can be used in association with the laboratory analysis so as to make further reliable assessment of liquefaction potential and its seismic effect.