Abstract: Abstract Objective To investigate the prevalence of type 2 diabetes and its risk factors in old population in Tianjin. Methods select the target population of urban and rural areas and meet the residents live 5 years and above. A cross-sectional study was conducted in this research. Using the multi-phasic stratified cluster sampling, we selected 4325 residents who are more than 60 years old in Tianjin. We collect information of risk factors throughout face-to-face questionnaire, fasting blood glucose and testing physical examination. Finally, unconditional multivariate logistic regression model was used to explore the risk factors for T2DM in old population. Results The prevalence of type 2 diabetes based on the criterion of FBG≥6.1mmol/l was21%（standardized prevalence:19.88%）；The prevalence of type 2 diabetes which based on the criterion of FBG≥7.0mmol/l is 16.43% (standardized prevalence:15.55%).And both of the prevalence in female was higher. The difference was statistically significant(χ2=13.12、13.05，both P<0.01).Upon the examination, the prevalence of type 2 diabetes which based on the criterion of FBG≥6.1mmol/l in male and female and the prevalence of type 2 diabetes in male which based on the criterion of FBG≥7.0mmol/l in urban was higher than that in rural, and the difference was statistically significant(χ2=48.90、4.59、52.96，P<0.01、P<0.05、P<0.01).The results of multivariate logistic regression showed that the risk factors for type 2 diabetes development in old population may be weight change, family history of diabetes, waist, hypertension(OR=1.105，3.642，1.038，1.476，all P<0.01). While the protective factors may be intake of more fresh vegetables, fruit, dairy(OR=0.292，0.497，0.663，0.707，0.681，0.883，all P<0.05). Conclusions The prevalence of type 2 diabetes in old population in Tianjin is similar to the level of the other big cities in china. Analysis of influencing factors are mainly changes of body weight, family history, waist and hypertension may be the risk factors, intake of more fresh vegetables, fruit, and dairy may be the protective factors.

Key words: Prevalence, Diabetes, Old age population, Risk factors