The study was dealt with the responses of Fagopyrum eschlentum and Fagopyrum cymosum root exudates to aluminum stress with sand culture medium. Exudation of electrolyte, sugar and amino acids were measured with four treatments of aluminum (0, 0.05, 0.1,0.2 g/kg Al~(3 )). The results that the exudation of electrolyte and soluble sugar increased with increase of aluminum treatment concentration. The change of exudation of amino acid was similar with the exudation of electrolyte and soluble sugar when the Al treatment concentration was low than 0.1 g/kg, but it was reverse while when the Al treatment concentration was high than 0.1 g/kg. These results indicated that the root exudates of Fagopyrum eschlentum and Fagopyrum cymosum altered with different aluminum treatment and the changes of root exudates under the stress of aluminum maybe relate with mitigation of aluminum toxicity.