Combined with concrete practical project,it introduces the choice of raw material and mixing rate of passenger line basement project improving project,elaborates the features and constructing crafts of grey soil,discusses the quality controlling measures of common disease in grey soil,which can be used to guide the on-spot construction.

Combined with engineering instance,this paper analyzes the causes of the problems probably existed in paving road bed soil,grey soil and lime-fly ash macadam and in pavement construction,and proposes treatment measures in light of different problems,in order to ensure construction quality of road.