Progressing by grades. Different grades are divided within each level; grammar points and vocabulary are based on "The Outline of Studies for Long-term Chinese Courses of Foreign Students in Chinese Colleges"; progressing step by step. Well-conceived system. Systematic language knowledge, dealing with all skills of the language; unique text designs; comprehensive training on listening, speaking, reading and writing skills; promoting the interaction between teaching and learning. Most up-to-date information. The most current commonly-used mandarin Chinese, truthful language material, practical exercises. Closely compatible with the HSK test. Scientific and practical. Texts, language points, notes and exercises are arranged scientifically; practical language and various tables and graphs make things easy both for students and for teacher. Interesting and rich contents. Interesting and lively texts with rich contents. Focusing on world issues, linking