Abstract: Immobilization experiments were performed to investigate the immobilization effect of the sulfur materialscalcium sulphide (CaS), sodium dithiocarbamate (DTCR) and 2, 4, 6-trimercaptotriazine (TMT55) on reducing available cadmium (Cd) in contaminated alkaline farmland soils. The results show that the order of the DTPA available cadmium reduction efficiency of the three passivants in the two soils (from Xinxiang and Jiyuan in Henan Province) was TMT55 > DTCR > CaS, under the same conditions. In Xinxiang Cd contaminated soil (DTPA-Cd 1.56 mg·kg^-1) after adding 0.10% (mass fraction) CaS, DTCR and TMT55, the available Cd content of the soil reduced by 21.15%, 48.71% and 41.69% after 30 days, respectively, compared with the controlled experiment. In Jiyuan Cd contaminated soil (DTPA-Cd 0.97 mg·kg^-1) after adding 0.10% (mass fraction) CaS, DTCR and TMT55, the available Cd content of the soil reduced by 10.42%, 40.43% and 40.70% after 30 days, respectively, compared with the controlled experiment. DTCR and TMT55 had the advantages of low dosage and high efficiency compared with other materials. It indicates that DTCR and TMT55 are potential materials for remediation of Cd-contaminated alkaline farmland soil.