Level of internationalization is an important index of disciplinary development.However,as the world’s most populous country,China′s internationalization in demography has not been developed to a corresponding level.By defining disciplinary internationalization and drawing upon a questionnaire survey data,this paper examines the present situation of the internationalization of Chinese population science,and discusses the difficulties and determinants of integrating Chinese population science into the international academic community.The paper argues that internationalization of Chinese population science is declining,the direct and deep-seated determinants of which are shrinking consciousness and capacity in internationalization of the entire demographic circle in China,and deficiencydeficiencydeficiencies in the culture and system of the population science.Therefore,the important approach to improve internationalization level of China′s population science is to strengthen the international science culture construction and to establish the supporting disciplinary system.