Objective:To study the effects of obesity induced by high-fat diet on T lymphocyte subsets in the adipose tissue in mice.Methods:C57BL/6 male mice were randomly divided into 2 groups, the normal control group and high-fat diet group.After feeding 16 weeks, serum was separated and CHOL, TG, HDL, LDL and glucose levels were measured by automatic biochemical analyzer.The concentrations of TNF-αwere determined by ELISA kit.FACS was used to analyze the number of T cells and the percentage of subgroup in epididymal fat adipose tissue.Results:Compared with control group,body weight,weight gain,epididymal fat pad weight,perirenal fat weight,blood lipids,glucose and TNF-αwere significantly increased in high-fat diet group,but there were no difference in the thymus index and spleen index between the two groups.Compared with the control group,the mice fed a high-fat diet had increasing proportion of CD3+T cells,CD4+T cells and CD8+T cells in adipose tissue and there was a significant increase on the proportion of Th1 and Th17 sublineage in the HFD group.Conclusion:High-fat diet induced obesity can lead to the increasing proportion of CD3+T cells,CD4+T cells and CD8+T cells in epididymal fat pads and generate a progressive Th1 and Th17 bias.