Objective Observe the relation of phlegm-dampness constitution and insulin resistance in first-degree non-diabetic relatives of patients with type 2 diabetes.Methods Collected first-degree relatives without mabetes of patients with type 2 diabetic patients 87 cases.Among these 87 cases,39 cases were phlegm-dampness constitution and 48 were not.Fasting plasma glucose(FPG)and fasting insulin(FINS)were measured,and insulin resistance index(IR)was calculated.Results There were significant differences between the two groups in FINS and IR(P＜0.05)..Conclusion The IR of the First-degree non-diabetic relatives with phlegm-dampness constitution of patients with type 2 diabetes have greater insulin resistance than the First-degree non-diabetic relatives with non-phlegm-dampness constitution of patients with type 2 diabetes.