In suit chemical immobilization has been considered as a low-cost and widely used technology in the remediation of heavy metal contaminated farmland soil, but this technology only temporarily reduces the mobility and bioavailability of heavy metals. Along with time, the immobilized heavy metals may be released back into the soil. Thus, the remediation stability is the key to the success of chemical immobilization of heavy metals contaminated soil. This paper summarized the present researches about the kinds of immobilization amendments, immobilization mechanisms, the influence factors and research methods of immobilization stability, deeply analyzed the research situation and existing problems of immobilization stability. The prospects and limitations of chemical immobilization remediation were also discussed. Future work should focus on the study of immobilization mechanisms, the prediction model of immobilization stability and the improvement of scientific approach of in suit chemical immobilization stability.