The epidemiological data of 300,000 people in 14 provinces and cities in 1980 showed that the prevalence of diabetes mellitus was 0.7%. In 1994-1995, an epidemiological survey of 210,000 people in 19 provinces and cities nationwide was conducted, and the prevalence of diabetes mellitus in the 25-64 age group was 2.5% (population The prevalence of diabetes in the 25-64 age group was 2.5% (population standardized rate of 2.2%) and the IGT was 3.2% (population standardized rate of 2.1%). The prevalence of diabetes has increased in the last decade, and the 2002 National Nutrition Survey was conducted in conjunction with a survey on the prevalence of diabetes. The survey used fasting blood glucose >5.5 mmol/L as a screening indicator, and those above this level were subjected to an OGTT test. The prevalence of diabetes was 4.5% in urban areas and 1.8% in rural areas among people aged 18 years and older. In urban areas, the prevalence of diabetes was 2.96%, 4.41%, and 13.13% for those aged 18-44 years, 45-59 years, and 60 years or older, respectively, while in rural areas, it was 1.95%, 0.98%, and 7.78% for the corresponding age groups. The epidemiological survey of diabetes was conducted in 14 provinces and cities in China. Through weighted analysis, after taking into account the factors of gender, age, urban-rural distribution and regional differences, it was estimated that the prevalence of diabetes among adults over 20 years of age in China was 9.7%, and the total number of adults with diabetes in China reached 92.4 million, including 43.1 million in rural areas and about 49.3 million in urban areas. China has probably become the country with the largest number of people with diabetes in the world. It should be noted that the survey methods and diagnostic criteria are inconsistent, such as the change of fasting blood glucose cut point for diabetes diagnosis from ≥7.8 mmol/L to ≥7.0 mmol/L after 1997. Therefore, if the recent diagnostic criteria are used, the prevalence of the first 3 survey results in the table is underestimated. In terms of survey methods, the first 4 were performed by screening high-risk groups before performing a glucose tolerance test. 1980 was an OGTT test with 100 g of glucose using positive urine glucose plus 2h postprandial glucose, while the 1986 and 1994 surveys used 2h glucose to screen high-risk groups, including some with relatively normal 2h glucose (2hPG ≥ 6.7 mmol/L), and the 2002 survey used fasting glucose to screen high-risk groups, including some with relatively normal 2h glucose (2hPG ≥ 6.7 mmol/L). In 2002, fasting glucose was used for screening. The different screening methods may lead to biased prevalence estimates, such as low urine glucose sensitivity, screening with fasting glucose may miss IGT or diabetic populations with normal fasting glucose, and screening high-risk populations with 2h postprandial glucose may miss patients with impaired fasting glucose. the national diabetes epidemiological survey completed in 2007-2008 used the natural population OGTT test to investigate the prevalence of diabetes, which may more accurately reflect the prevalence of diabetes and prediabetes in China. Currently, we lack representative studies on the prevalence and incidence of type 1 diabetes. It is projected that the proportion of type 1 diabetes in our overall diabetes population should be less than 5%. The results of several surveys mentioned above are the overall situation of diabetes, which includes people with type 1 diabetes.