The Sand Compaction Pile (SCP) method is a ground improvement technology that increases the density of the ground by constructing sand piles through penetration and repeated withdrawal/re-driving of the casing pipe. This method is the most widely used liquefaction countermeasure method in Japan. This method has been recognized in previous investigations that its improvement effect is mainly derived from an increase in soil density. However other factors such as unique stress history during the SCP work process also have been reported to contribute to the effectiveness. In order to more accurately reproduce the behavior of the ground during the construction of Sand Piles, a stress history simulating the SCP work process was applied to specimens, and the effects of the stresses were observed. The material used in this test is silica sand. These specimens were prepared by air-pluviation method to reach a relative density of 60% (Dr=60%). The specimens were consolidated with a lateral stress ratio of 0.5 (K0=0.5), then the stress history including lateral pressure increase and cyclic shear stress was applied, and finally, liquefaction resistance was confirmed by cyclic loading. After applying stress history, an increase in liquefaction resistance was observed in these specimens. This increase was larger than that of specimens subjected only to lateral stress increase without a shear stress history.