Using the Shangshu 19 as plant material，alleviation effects of various concentration of calcium on aluminum stress of sweet potato were examined by soil culture experiment.Different levels of aluminum levels(0，1 g/L)and calcium treatmentlevels(0,0.8,1.6,2.4 g/L)were used to study the different concentration of calcium on aluminum toxicity of sweet potato.The results showed that under the stress of aluminum，increased calcium supply alleviated the toxicity by aluminum，significantly weaken the aluminum stress to the root activity，calcium content in leaf and potato，the leaf chlorophyll content，PSⅡand Fv/Fm，the blade SOD and POD，the accumulation of lower malondialdehyde(MDA)content，and improved the plant resistance to aluminum stress.