Abstract: With the rapid development of medical image processing,the locating methods of lesions in the medical applications attract more and more people's attention.With CT images as the research object,in view of the pulmonary tuberculosis of positioning.This method first made the preprocessed image a binary one,and employed morphology techniques to get rid of small bridges,then labeled every connectivity component in that binary image respectively.Finally through the decision-making device which including the area,perimeter,location parameters,shape parameters characteristics to judge the tuberculosis and locate the lesions area.