A microwave extraction was used to extracted flavonoids from Aloe.According to single factor experiment and orthogonal test,the optimal condition of extraction was investigated.The optimal condition of extraction were obtained as follows:80% alcohol as solvent,560 W as microwave power,30 s as radiation time and 1∶5.0 as solid/liquid ratio.The content of flavonoids in fresh Aloe was 0.52 mg/g,the recycle rate of the method was 93.3%.Contrasted with 4 h for alcohol reflux method,it took 30 s for microwave ext...