Abstract: Objective To investigate the situation of vitamin D level in Chaoyang district of Beijing in recent two years,and explore the influencing factors of vitamin D deficiency and the correlation with blood lipid.Methods A cross sectional study was conducted to include 3905 subjects who underwent physical examination at Beijing first integrated traditional Chinese and western medicine hospital.Venous blood was taken to test 25-hydroxy-vitamin D[25(OH)D] and blood biochemical indexes.Multiple linear regression analysis was used to evaluate the correlation between 25(OH)D and blood lipid.Results The average serum 25(OH)D level of all subjects was(16.22±6.95) ng/ml,deficiency serious was found in 636 cases (16.29 %),deficiency was found in 2372 cases(60.74%),insufficiency was found in 713 cases(18.26%),plenty was found in 184 cases(4.71%).Subjects with different 25(OH)D levels had statistically significant differences in gender,age,weight,BMI,waist circumference,waist to hip ratio,systolic blood pressure,diastolic blood pressure,fasting plasma glucose(FPG),uric acid(UA),creatinine(Cr),total cholesterol(TC),triglyceride(TG),high-density lipoprotein cholesterol(HDL-C) and low-density lipoprotein cholesterol(LDL-C)(P<0.05).There were statistically significant differences in 25(OH)D levels among subjects of different gender(P=0.010),different BMI and gender(P=0.030) and physical examination in different season(P<0.001).Age distribution of subjects with different 25(OH)D levels was statistically significant(P＜0.001).The results of multiple linear regression analysis showed that 25(OH)D level was negatively correlated with TC(r=-0.35,P=0.016),TG(r=-0.28,P=0.046),LDL-C(r=-0.33,P=0.022),waist circumference(r=-0.30,P=0.035),waist to hip ratio(r=-0.30,P=0.032),and positively correlated with HDL-C(r=0.27,P=0.049).Conclusion Vitamin D deficiency in Chaoyang district of Beijing is common and should be paid attention.Vitamin D deficiency is associated with age,gender,seasonal variation，waist circumference,waist to hip ratio,BMI and blood lipid.

Key words: Vitamin D, Medical examination group, Blood lipid, Correlation analysis