With development of the belt and road in China, more and more Foreign students visit China and immerse in Chinese learning. Regarding to Chinese teaching, the term "language custom" is a subordinate category in Teaching Chinese to speakers of other languages (TCSOL). Language learning includes setting, culture, and the interference of the first language. Language performs multiple functions including communication, cultural recognition and identity recognition. This paper addresses some intersections among language learning and cultural custom, analyzing Chinese cultural customs and discussing both theoretical advances and some actual case studies.