Astabilizedsoilstructureformation model wasintroduced. In ordertoformcompact stabilized soil structure, cementitious hydrates were needed to wrap and bind the soil aggregates.Meanwhile, expansible hydrates were needed to squeeze and fill the pores, especially the pores in the aggregates. The experimental results show that the influences of various chemical characteristic factors of soil on the strength of the stabilized soil are boiled down, for the influence on the concentration of Ca(OH)2 in the pore solution of the stabilized soil, and the amount of CSH generated by cement. Fi-nally an optimization design method is proposed, with which the stabilizer can be designed according to characteristics of soil samples.