Using cement to solidify/stabilize the heavy metal contaminated soil is a common method of disposal.This article focused on the effects of solidification of Pb-contaminated soil which is disposed by composite curing agent added montmorillonite.The experiment adopted design of 12 groups curing agent with different content of montmorillonite and cement.There were four steps to obtain experimental data,i.e.,preparation of contaminated soil,compaction molding,strength test and dissolution test.Four different leaching conditions were analyzed in the leaching test.The results showed that even though solidification product met the standards of the TCLP,but the concentration of leaching solution was very high in the worse conditions,far below the standards.So according to different conditions,it is necessary to consider to worse conditions in the actual projects.