This expert themed forum focuses on "Research on Chinese Inheritance Language Learners", exploring the definition, delineation, and connection with individuals, families, or history of inheritance language. The study of inheritance language has received attention, mainly due to increased social mobility and an increase in immigration numbers. The University of California, Los Angeles has established a National Inheritance Language Resource Center to develop effective inheritance language teaching methods. The study of Chinese as an inheritance language, also known as Mandarin research, has always received attention from the academic community and has produced a large number of achievements. Chinese language learners have characteristics such as significant internal differences, diverse acquisition sequences, and the complexity of the Chinese language itself. Chinese language teaching and acquisition research is a special part of international Chinese education, including first language acquisition, second/foreign language acquisition, bilingual/multilingual acquisition, etc., with broad research space. The heterogeneity and complexity of Chinese language learners are expected to contribute to acquisition theory and cognitive science.