Abstract: Objective:To improve imagelogical diagnostic level of primary tracheocarcinoma. Methods :X ray,CT and MRI examination were done and clinical pathology was analyzed in 8 cases with primary tracheocarcinoma. Results :The tumor appeared as follows:sessile cauliflower like or papillary mass with size of 2～4 5cm in tracheal wall resulting lumen stenosis,mediastinal lymph node enlargement with metastasis in 1 case.Pathological diagnosis:squamous cell carcinoma of trachea in 4,adenoidcystic carcinoma in 4. Conclusion :Different posture of MRI examination was superior to X ray and CT in shape,size,infiltration of tracheal wall and mediastinal lymph node metastasis of tracheocarcinoma.It was helpful to select clinical treatment and decide prognosis.