Abstract: Objective To increase the positive rate of diagnosis by comparing with two different Methods for lung biopsy.Methods 293 cases were not be positively diagnosed by radiographs、sputum、cytdogy、bacteriology and fiberbronchoscopy from 1988 to 2000.These cases were examined by two different Methods of lung biopsy.Results Lung biopsy through skin conducted by X-ray、CT and B somascope was used in 148 cases and the positive rate is 87.8%;145 cases were examined by fiberbronchoscopy,with 79.3% positive rate.The frequency of complications was respectively 23.6% and 21.4%.Conclusion Different Methods of lung biopsy have different Results and diferent clinical meanings.Lung biopsy conducted by CT has the most accurate rate of diagnosis.

Key words: Biopsy, Fiberbronchoscopy