Abstract: 35 cases of pulmonary sequestration,identified by surgicea-pathologically were analysed .Only 6 cases were correctly diagnosed before operation,the other 2 cases were misdignosed as cyst,lung cancer or benign tumor.In 35 cases with 30 cases of intralobular type and 5 cases of extra lobular type,the lesion were found in the left lower lobe(24),right lower lob (11).The manifestation of Chest X-ray were well defined mass-like density,cystic shadow,or infiltration shadow.Imagiy with CT scan and MRI has important value in establishing a definite diagnosis b;showing the anomalous artery.However,retrograde aortodraphy plays a decisiv role for confirming the diagnosis.