Abstract: Jatropha curcas seedlings in the solutions culture were used to examine the effects of different concentrations of acid-aluminum(Al³⁺:0,0.01,0.1,1,5 mmol/L)on the following physiological indices,including root vigor,malondialdehyde(MDA),proline(Pro) content and peroxidase(POD)activity of leaves at three temperatures(24,29,34℃).The results indicated that under the same Al³⁺concentration,the seedlings'root vigor decreased,the amount of MDA,Pro and the POD activity in leaves increased as the temperature rose.On the other hand,as the Al³⁺ concentration rose,root vigor trended to decrease,the amount of MDA and Pro and the POD activity trended to increase at each temperature.Mild amount of Al³⁺ stimulated the root vigor,brought down the MDA and Pro content as well as the POD activity at lower temperatures(29℃,Al³⁺:0.01 mmol/L;24℃,Al³⁺:0.01,0.1 mmol/L).However,all seedlings at three temperatures were damaged more or less if the Al³⁺ concentration exceeded 1 mmol/L.Treated the seedlings with 1 mmol/L Al³⁺ at 29℃,the damages decreased with the increase of exogenous calcium.