Abstract: A use of bio-transformed bear bile powder in preparation of anti-inflammatory drugs is disclosed. The present invention carries out a comparative research on the anti-inflammatory drug activity of bio-transformed bear bile powder and natural bear bile powder. A research is made on the effect of the bio-transformed bear bile powder and natural bear bile powder on carrageenan-induced rat inflammation models, and a research is made on the effect of the bio-transformed bear bile powder on LPS-induced lung inflammation in mice. Experimental results show that the bio-transformed bear bile powder administration group obviously reduces plantar swelling of carrageenan-induced inflammation model in rats, and the effect thereof is not lower than that of the natural bear bile powder. Both the bio-transformed bear bile powder and the natural bear bile powder can significantly reduce levels of the inflammatory factors IL-6 and TNF-? in the lung and the serum.