Abstract: To clarify the dynamic effects of different pH adjustors on available Cd in paddy soil, four kinds of pH adjustor were added to Mashani soils with 1, 5, 10 and 20 mg/kg exogenous Cd, and the adjustors’effect on Cd effectiveness on the 15th and 45th day was studied by indoor culture experiment. The results showed that compared with CK the addition of SH1.5, SH3, GG1.5 and GG3 adjustors could increase soil pH value to a certain extent, thus to reduce the available content of Cd in soil. The contents of available cadmium in Cd contaminated soil with the four concentrations extracted by TCLP and CaCl2 were negatively correlated with soil pH value. The Cd contents of TCLP extract state and CaCl2 exchange state decreased by 17.41%~48.02% and 30.95%~87.89%, and the remediation effect of SH3 was outstanding. The results could provide scientific guidance for safe production and resistance control in Cd over-standard paddy field.