In this paper, the reflux of ethanol and the technique of separation with silica gel were used to extract and separate ursolic acid from Forsythia suspensa (Thumb.) Vahl. The optimal condition of reflux extraction and the parameters of adsorption were thoroughly studied.By orthogonal design, the optimal condition of is: the temperature is 85 ℃, the ethanol concentration is 75%, liquid to solid radio is 10, extraction time lh, extracted 3 times, the yields of ursolic acid were 6.182mg/g; By uniform design, t...