One of the important preconditions for engineering practice of deep cement mixing method is to conduct mixing ratio experiment for cement-mixing soil.Based on a large amount of laboratory experiments,we propose two different sampling methods for cement-mixing soil,i.e.,dry soil sampling method and wet soil sampling method,and corresponding test procedures,and compare the advantages,disadvantages and applicability of each method.It is concluded that:1) dry soil sampling method should be adopted for experiments in which the objective water content is variable,or smaller than the initial water content;2) wet soil sampling method is more suitable and efficient when it aims to study the effects of other parameters on the strength of cement-mixing soil with initial water content.Taking the alluvial clay from Hong Kong as a research object,we study the effect of water content on the unconfined compression strength of cement-mixing soil by mixing ratio experiment with dry soil sampling method.The results show that the strength of cement-mixing soil decreases as water content increases,and when the water content is more than 70%,the strength increases slowly with the increasing curing period.