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This paper is to analyze the differences between the 3rd edition and 4th edition of Oxford Advanced Leers English- Chinese Dictionary (hereafter referred to as ALECD3 and ALECD4). By making comparison between the two dictionaries in the leers and compilers perspectives, it highlights the priority of the 4th edition in content and compilation. Following a brief introduction in Part 1,Part 2 examines the innovations the 3rd edition has made in verb - patt scheme, compounds, entries,examples,adjectives and appendices from the leers perspective. Part3 holds a theoretical discussion of prescription and description in the 4th edition.