In this article,we examine ideology security education in China with a special focus on English textbooks in senior high school.Ideology security education has long been treasured in China and high school students are the reserve forces of national development and rejuvenation.Core socialist values are the mainstream value orientation initiated by the Communist Party of China and are originated from the system of core socialist values.The research takes the prevailing five compulsory textbooks as the subject.The research framework is informed by critical discourse analysis theory.Textual analysis is applied as a methodological approach to determine the main value orientation embodied in the senior high school English textbooks.The distribution of three value levels of nation,society,and individual is investigated.The study finds evidence of the dissemination of core socialist values throughout the textbooks and the disproportion of the three-dimensional core socialist values.The value orientation is explicitly and implicitly embedded in the textbooks.In response,we argue for the role shift of senior high school teachers from knowledge transmitters to value guides and the responsibility of cultivating students’values,which ought to be the ideological and political significance of foreign language teaching.