Micro-reactions are faithful presentation of a person's inner thoughts, and are accurate clues to get to know a person's true inner ideas. After eight years of research, cooperation with 15 judicial organs, and based on 600-hour criminal case videos, the author Jiang Zhenyu comprehensively analyzes 8 common types of micro-reactions (comfort reaction, freeze reaction, love & hate reaction, look-up reaction, territory reaction, combat reaction, victory & defeat reaction, and respiratory reaction), and uses abundant cases to help the readers accurately and deeply analyze the ""petty actions"" of human body.