To explore the correlation between tongue manifestation and age，body mass index(BMI)，complications，and laboratory indicators in overweight/obese type 2 diabetic patients.Methods:The tongue manifestations of overweight/obese type 2 diabetic patients were collected using portable tongue diagnosis instrument(DS01-G)，and their other observation indicators were also obtained.Results:The Lab-L value of the whole tongue texture in the young group was higher than that of the old group，and the young group also had higher frequency of tooth marks than the young-old group and the old group.The Lab-L and Lab-b values of whole tongue texture and the Lab-b value of whole tongue coating were positively correlated with BMI.In terms of the frequency of greasy coating，the obese group was higher than the overweight group，and the group with chronic complications was higher than the group without chronic complications.Spotted tongue was less frequently observed in the group with chronic complications than the group without chronic complications.The Lab-a value of whole tongue texture in the group with major vascular complications was lower than that in the group without complications.Tongue color parameters were correlated with fasting blood glucose(FBG)，2 h postprandial blood glucose(2 h PBG)，triglycerides(TG)，total cholesterol(TC)，low-density lipoprotein(LDL-C)，apolipoprotein B(ApoB)，and uric acid.Four equations were obtained by regression analysis：FBG=64.045-0.409×Lab-b of whole tongue，TC=1.251+0.034×Lab-L of whole tongue coating，LDL-C=-16.986+0.139×Lab-a of whole tongue coating，and ApoB=13.111+0.028×Lab-a of whole tongue coating.Conclusion:The tongue manifestations of overweight/obese type 2 diabetic patients are correlated with age，BMI，complications，and laboratory indicators，and can predict some laboratory indicators.