Objective To study the expression of cytokine in the cancer cachexia patients and to discuss the relationship with cancer cachexia.Methods To compare the IL-1、IL-6、TNF-α、IFN-γ levels with 80 cases patients of cancer cachexia、40 cases healthy people and 40 cases patients of non-cancer cachexia.To oral medroxyprogesterone with the 80 cases patients of cancer cachexia and give the nutritional support of four weeks.Four weeks later,to detect the levels of IL-1、IL-6、TNF-α、IFN-γand compare with pre-treatment.Results Compared cancer cachexia group with non-cancer cachexia group and healthy group,the levels of IL-1、IL-6、TNF-α、IFN-γ increased.P0.05,there were significances in statistics;The 80 cases patients of cancer cachexia through four weeks treated,the levels of IL-1、IL-6、TNF-α、IFN-γ decreased.P0.05,there were significances in statistics.Conclusion Cytokines are relevant to the cancer cachexia and playing an important role.