The DTP was obtained by alkali extraction and alcohol precipitation from Dendrobium thyrsiflorum Rchb. f and was administered on normal mice with 400 mg/kg,600 mg/kg and 800 mg/kg respectively through stomach for 10 d .

• 球花石斛采用碱提醇沉法得到球花石斛多糖,分别以400、600、800mg/kg小鼠灌胃给药连续10d。