680 Comprehensive Expressions for HSK (Advanced) is a HSK-oriented book for advanced Chinese learners. This book has two parts. The first part, which practices one of the testing items in HSK—Comprehensive Expression, contains a total of 680 sample questions and self-testing questions as well as the answers and explanations to these questions; the second part, which analyzes the grammar of these words, discriminates the synonyms of notional words, functional words and idioms and explains the important and difficult grammatical points for students’ reference.