Abstract: This paper was designed to explore effects of two soil amendments, biochar (with some pig manure) and ground oyster shell (as biological lime), on arsenic (As) pollution in paddy soil in an attempt to provide some technical reference to the region for controlling As pollution in paddy fields under the double rice cropping system. The two soil amendments are both porous and high in specific surface area and adsorption capacity. To that end, a pot experiment was conducted to compare application of biochar plus mineral lime and ground oyster shell with application of pig manure plus mineral lime and ground oyster shell in effect on As pollution. Soil available As in the pot soils and As contents in rice straw, grain and rice in different treatments were analyzed, and the relationship between soil available As with As absorption of rice quantified. Results show that compared with the soil in CK, the soil in the treatment of pig manure plus mineral lime and ground oyster shell were 29.1%-57.0% lower, and the soils in the treatment of biochar plus mineral lime and ground oyster shell were 35.1%-65.9% lower in content of soil available As. The decrease in soil available As in turn lowered the As accumulation in the crop. The straw, grain and rice in the two treatments was 67.6%-68.5%, 66.6%-67.8% and 76.0%-76.9% lower than their respective one in CK in As content. Meanwhile, it was found that the relationship between soil available As and As absorption of rice could well be fitted with an exponential equation, with R² > 0.75, and P< 0.01. Therefore, in acid paddy fields, it is feasible to reduce soil available As and then As absorption of rice through adding biochar and ground oyster shell, but the effect is not so obvious when soil available As content is lower than 30 mg·kg^-1.