In order to investigate the amelioration effect of calcium carbonate and oligosaccharides on acidic paddy soils in South China，a pot experiment was conducted with six treatments:no fertiliser (T1)，regular fertiliser (T2)，regular fertiliser + calcium oxide (T3)，regular fertiliser + calcium carbonate (T4)，regular fertiliser + calcium carbonate sucrose mixture (T5)，regular fertiliser + calcium carbonate seaweed oligocaccharide mixture (T6).The effects of different amendment treatments on soil physicochemical properties and rice yield were analyzed.Calcium carbonate oligosaccharide mixtures were effective in increasing the soil pH and reducing the soil exchangeable acid content，with the calcium carbonate sucrose mixture increasing the pH by 0.92 units and reducing the exchangeable acid by 80.39%，and the calcium carbonate seaweed oligocaccharide mixture increasing the pH by 1.39 units and reducing the exchangeable acid by 91.37%.Compared to calcium carbonate alone，calcium sucrose mixtures of calcium carbonate elevated aluminum in the organically bound state and aluminum humate by 20.26% and 5.30%，respectively，while aluminum in the inorganic adsorbed state decreased by 12.06%.Calcium carbonate seaweed oligocaccharide mixture had a total exchangeable radical ion of 5.94 cmol/kg and its cation exchange with calcium carbonate sucrose mixture was 9.41 and 9.50 cmol/kg.Both calcium carbonate sucrose mixture and calcium carbonate seaweed oligocaccharide mixture treatments increased rice yield by 10.64% and 10.21%，respectively，as compared to regular fertiliser.The results showed that all calcium carbonate and oligosaccharides could raise soil pH，reduce exchangeable acid content，alleviate aluminum toxicity by complexing exchangeable aluminum，prevent acid reflux，and promote rice growth，with calcium carbonate sucrose mixtures being the most effective.