Steel slag have the potential to ameliorate heavy metal contaminatedsoils，but their effectiveness and the mechanisms involved are not fully understood. The effects of amendments onsoil pHvalue，heavy metal availability and rice absorption of paddy soil and their relationship with soil properties were explored to provide scientific basis for the development and application of amendments. A pot experiment was conducted on apaddy soil amended with twoamendments(T1 andT2) derived from steel slag at twolevels(T1L，T1H；T2L，T2H). Soil pHvalue，availablesilicon，available heavymetals，and heavymetals(cadmium，zinc，copper)uptake by rice as well as their relationships were determined.Compared withCK treatment，soil pH value of T1L and T1H weresignificantly increased by 0.64 and1.02，while soil pH value of T2L and T2H treatments significantly wereincreased by 0.27 and0.56，respectively( P<0.05). The soil available silicon content in T1L and T1H treatments significantly were increased by 5 and 22times，respectively( P<0.05)，which was higher than that in T2 amendments. Compared with CKtreatment，the available cadmium，zinc and copper contents in T1H treatment significantly weredecreased by37.21%，45.57% and95.30%，respectively( P<0.05). The soil available zinc contents in T2L and T2H treatments significantly weredecreased by 31.55% and30.67%，while the soil available copper contents were decreased by 6.53% and19.32%( P<0.05)，respectively. Compared with CKtreatment，the zinc contents of rice grain in T1L and T1H treatments significantly were decreased by 23.44% and18.12%，respectively( P<0.05). The zinc and copper contents of rice grain and straw had no significant differences after adding T2 conditioner. The concentrations of soilavailablecadmium，zinc and copper werenegative correlation with soil pH value and concentration of soil availablesilicon； while the contents of cadmium in grain and straw were negative correlation with soil available silicon. The data indicated that the amendment with high pH and silicon contentcould effectively increase soil pH value and available siliconcontent，and reduce availability of heavy metals and uptakes by rice in such paddy soil.