Objective To analyze the result of glycated Hb (HbA1c) measurement and related factors in normal glucose tolerance (NGT) population. Methods A 75 g glucose tolerance test (OGTT) was administered in all participants from diabetes (DM) screening population of Shougang four community. HbA1c, fasting plasma glucose (FPG), 2 h plasma glucose (2 h PG) after OGTT and blood biochem. test were conducted. Anthropometric measurements were performed to all the subjects. A total of 9 711 individuals with normal FPG and 2 h PG were included for data anal. All the subjects were divided into three groups by levels of HbA1c, and the clin. characteristics of the three groups were compared. Logistic regression was used to analyze the correlation of HbA1c to related factors. Results HbA1c was normally distributed in NGT populations. The range of HbA1c was 4.9%-6.5%, (5.69±0.44)%. There was difference in HbA1c between men and women (P<0.05). Especially, there was significant difference (P<0.01) in the older group (60 to 79 years old). HbA1c increased with age. There was significant differences among the young group (16 to 44 years old), middle-aged group (45-59 years), the elderly groups (60 to 79 years) and very elderly group (≥80 years) in HbA1c, FPG and 2 h PG (P<0.01), whereas there was no significant difference between the elderly groups and the very elderly group. There were statistically significant between HbA1c≤5.6% group and HbA1c 5.7%-6.4% group, HbA1c≥6.5% group in body mass index (BMI), waist-hip ratio (WHR), systolic blood pressure (SBP), serum cholesterol (TC), triglyceride (TG), low d. lipoprotein cholesterol (LDL-C) levels, FPG and 2 h PG (P<0.01 or P<0.05), whereas there was no significant difference between HbA1c 5.7%-6.4% group and ≥the 6.5% group. Logistic regression anal. showed that HbA1c was pos. correlated with gender, age, BMI, WHR, SBP, TC, FPG and was neg. correlated with DBP, HDL-C. Conclusions HbA1c is pos. correlated with age and FPG in the population with normal glucose tolerance. The non-diabetic population with high risk HbA1c should be monitor FPG, 2 h PG and related cardiovascular risk factors.