Abstract: Based on the data from Beijing,Zhengzhou and Kunming,this paper examines the internal structure and influential factors on the sense of security of urban residents with exploratory factor analysis.The results show that(1) the sense of security of urban residents includes 4 factors,namely,food security,life security,family security and social security;(2) the overall level of sense of security is relatively high.What urban residents concern most is food security;(3)age,health conditions and community environment affect the sense of security of urban residents sigificantly,while occupation,education and income don't make sense.