Abstract: At present the situation of adding stores on old buildings is increasing day by day.There are many methods of ground consolidation.Before consolidation method is determined,the foundation and structure of old buildings need checking,such as strength of supporting layer where the pile end is,allowable bearing capacity of the pile,subsidence of pile foundation and so on.Cement water glass grouting method is used to ground consolidation of adding stores buildings,this method has a lot of specific material properties,such as,grouting property is high(K=10^-6 cm/sec),coagulate time is quick (15~20 sec),strength is higher (5~20 MPa),and it can satisfy the new requirements of the ground for adding upper structure load.This paper also introduces an engineering example.