Language is embedded in society and culture, and for that matter, learning a foreign language involves learning its culture. This paper is concerned with the inseparability of culture and language in foreign language teaching, arguing that culture introduction is an effective way to promote students' cultural awareness and language proficiency. Foreign language textbooks are major channels for culture introduction. Therefore, this study attempts to analyze one set of English textbooks for Chinese secondary school students, and hence reveals the approaches to culture introduction in English textbooks.