Objective:To study the diagnosis and therapy of primary mesentery tumers.Methods:To review and analyse 34 cases of primary mesentery tumers.Results:The 5 year survival rate was 100% in the beniga tumers and the patients with malignant tumers died in 3 years.Conclusion:The malignant primary mesentery tumers had bad prognosis.Early diagnosis,operating and chematherapy in time were the keys to improve the survival rate.