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Abstract： Haycraft defined receptive vocabulary as “words that the student recognizes and understands when they occur in a text， but which he cannot produce correctly”， while productive vocabulary is “words which the student understands can pronounce correctly and use constructively in speaking and writing” （1978：44）. In English language teaching practice， students’ productive vocabulary size lags far behind there ceptive vocabulary size. Based on the SLA theories， many reasons caused this problem and some solutions will be discussed.