The book is intended for third-or fourth-year college students who have learned quite a number of English words together with other featuresof English. It aims to help the students summarize what they have learned and acquire a systematic knowledge of English vocabulary so that they can improve their ability to enlarge their personal vocabularies and choose the right words to use in a given context. The book is divided into eleven chapters. The first chapter of the book first briefly introduces the development of English and English vocabulary, covering the vocabulary features of English in different periods and English loanwords. The second chapter introduces lexics and some related concepts, and explains the classification of words. The third chapter discusses the word-building method in English, involving a variety of ways such as inflection, derivation, compound, transformation, mixing, abbreviation, inverse word formation. The fourth chapter introduces the meaning and composition of the word. The fifth and sixth chapters describe the relationship between the meanings of the words, discuss the word polysemy, homonymy, synonymy antisense, up and down the meaning of the relationship between the part and the whole. Chapter VIl explores the tendencies and causes of changes in meaning. Chapter VIII discusses the context and the meaning.