“警察”与“公安”是两个相互联系而又区分的概念,其内含随着社会历史的变迁和存在环境的变化而不断改变,对两个概念的词义梳理和考证有利于正确地认知两者之间的关系。“警察”与“公安”在词义、属性和法定内涵上存在区分,当前我国的公安工作也需要有选择地学习和借鉴现代警察科学的理论与方法。 “Policeman ” and “Public Security ” are two concepts that are interrelated and differentiated. Their connotation changes constantly with the changes of social history and the existing environment. The definition and verification of the two concepts are as follows: Which is conducive to correctly understand the relationship between the two. There is a distinction between meaning, attribute and legal connotation in police and public security. At present, public security work in our country also needs to learn and learn from the theories and methods of modern police science selectively.