Abstract In this paper the chemical reactions of various kinds of organic compounds, including alkenes, alkynes, alkyl benzenes, alkyl halides, alcohols, phenols, aldehydes, ketones, carboxylic acids, acid derivatives, β-dicarbonyl compounds, amines and diazonium salts, are summarized systematically in a graphical way. This work makes the organic chemistry knowledge systemized and is convenient for students to form a clear knowledge system.