“对外汉语教学语言”这一术语存在着名称混乱、外延不统一等问题。应从对外汉语教学语言的性质、使用者、适用对象、使用环境、适用范围、包含内容等角度来界定其内涵和外延。对外汉语教学语言具有双重功能、多重限制、严格规范等特点。对外汉语教学语言范围包括共性教学语言和专业性的教学语言。 “Language for Teaching Chinese as a Foreign Language ” There is the name chaos, the extension is not uniform and other issues. The connotation and extension of the teaching Chinese as a foreign language should be defined from the aspects of the nature, user, applicable object, environment of use, scope of application and inclusion of the TCFL. The teaching of Chinese as a foreign language has dual functions, multiple limitations, strict specifications and other characteristics. The scope of teaching Chinese as a foreign language includes common teaching language and professional teaching language.