Abstract: Several compacted loess samples with different dry densities are prepared, which are the typical loess in Lanzhou City. The dynamic triaxial liquefaction tests are conducted by using the WF-12440 hollow cyclic apparatus. Through analysis of the experimental data, the relationship between liquefaction stress ratio and vibration times of the saturated compacted loess with different dry densities is proposed, the quantitative relationship of influence on liquefaction stress of saturated compacted loess by the initial void ratio is established, and the dynamic strain characteristics of saturated compacted loess with different dry densities are analyzed. Moreover, the critical liquefaction stress ratio and the critical dry density under different seismic intensities are calculated according to the Seed simplified procedure for liquefaction evaluation. The results are excepted to provide guidance for the anti-liquefaction treatment of the site in real projects.