Inordertoanalyzethecompressioncharacteristicsoffoamedlightweightsoilun-der confined conditions， by using GDG series high pressure consolidation instrumenttOstudy the compression test of 28daysand120daysoffoam lightweight soil under standardcuring conditions.the characteristics of compression curve and the settlement relationshipare analyzed.It is compared difference with the ordinary concrete， soil and other materialsin terms of compressibility.The relationship are determined between the confined compres-sion modulus， the critical compressive stress and the changing age.The results show thatthe compression curve of foam light soil is atypical anti-"S"type， which can be divided intothree stages.The longer the age of foam lightweight soil conservation， the greater the com-pression critical load， the stronger the resistance to deformation，and the age affects thefirst stage of the compression curve.The compressive modulus of the foamed light soil firstincreases andthendecreaseswith theincreaseoftheload.Whentheloadexceeds 1200kPa， plastic deformation and damage occur.