According to the clay proportion of sandy soil,the vibroflotation method can be used with vibro-compaction without backfill or vibro-replacement with backfill.For a ground treatment engineering,the appropriate construction technology and reasonable technological parameters are crucial for the reinforcement effect and the project investment.The effect of vibration density is produced by the liquefaction of saturated sand which is subjected dynamic loadings inside soil caused by vibrator.On the basis of the growth model of pore water pressure,we derive the critical liquefaction time of saturated sand,and analyze the influence factors and engineering significance of the vibration duration time.We also discuss the adaptability and reinforcement effect of the two vibroflotation technologies of vibro-compaction and vibro-replacement through the two engineering cases.Finally,according to the type of sandy soil and their clay proportion,we divide the sandy soil ground into three types,select the suited obtain construction technology for different ground types,and obtain the proper range of parameters.