Abstract: Objective This study aims to compare cardiovascular metabolic indexes between adolescents with normal weight and invisible obesity,and to provide basis for evaluate obesity and cardiovascular metabolic risk of adolescents.Methods Atotal of 623 junior high school students were selected from one urban school in Harbin.Physical examination,body composition and metabolic biochemical test were carried out.There were 134 students classified as invisible obesity,defined as normal BMI but PBF >20% in male or >25 in female.A total of 235 students were selected as control group.Results The detection rate of invisible obesity was 36.3%(18.9% in boys and 48.6% in girls,respectively),with girls higher than boys(x2=34.06,P<0.05).The levels of TC and LDL-C was higher in invisible obesity group than control group,and the levels of TG were higher in invisible obesity group than control group among male adolescents,the levels of HDL-C were lower than control group among female adolescents (P< 0.05).There were no significantly differences in the level of blood pressure and blood glucose between in the two groups(P>0.05).Comparing with control group,hypertriglyceridemia was higher in boys with invisible obesity,while hypercholesterolemia and hyper -LDL-C were higher in girls with invisible obesity(P<0.05),but no significant differences in hypertension and hyperglycemia were found between two groups (P>0.05).Conclusion Invisible obesity is quite common among Chinese adolescents.Abnormal lipid metabolism already presents in invisible obese adolescents.Early identification of adolescents with invisible obesity would be effective for cardiovascular metabolic diseases prevention.