摘要篇首： To the editor: Recently, the International Expert Committee recommended using HbAlc as a diagnosing tool for diabetes and suggested HbAlc value of 6.5% as cut-off for the diagnosis.~1 In this recommendation, pre-diabetes was replaced by "sub-diabetes or high risk status" which was defined by HbAlc between 6.0% and 6.5%. The recommendation has triggered wide discussion on its potential influence on diabetes care, for example, the impact of the new diabetes diagnosis criteria on the prevalence of diabetes. We have noticed that the level of HbAlc correlated with oral glucose tolerance test (OGTT) based diabetes diagnosis criteria~2 is lower than 6.5%.~(3,4) We hypothesized that the new diagnosis criteria will reduce the prevalence of both diabetes and high risk population in Chinese population. To test this hypothesis, we calculated the prevalence of diabetes and high risk individuals in both community and hospital based diabetes screening population by using both OGTT based2 and HbAlc based diagnosis criteria.