Typos is a general term of misspelt and mispronounced characters, which can be said the common and difficult disease in learning. This book compiles characters and words that can be easily written incorrectly or mixed up. Dividing them into three sections--similar pronunciation typos, similar written pattern typos and radical error prone characters--the book includes interpretation, sentence-making and discrimination and relevant exercises. Students are expected to write less or no Misspellings through reading and exercises. The whole book has four volumes and can be used by primary school and junior middle school students.