Abstract: In this paper, by means of comparing the data of Cone Penetration Tests (CPT) in calibration chamber with thosa of cyclic triaxial tests,the applicability of CPT for evaluating the liquefaction potential of saturated sands as well as the major factors affecting liquefaction potential and CPT resistance of sands are discussed, and the correlation between field cyclic stress ratio causing liquefaction and modified cone resistance is proposed and compared with the correlations proposed by Seed and Robertson et al. Finally, the reliability of the proposed correlation is examined with field data for sites which have liquefied or not liquefied during earthquakes.