This study has borrowed the paradigm of oral CF to examine the effects of CF on the acquisition of grammatical forms in writing． Based on the " Interaction approach" ，it examined Chinese EFL learners' acquisition of English articles and prepositions with the task of spotting picture differences so as to explore the effects of integrating oral CF into writing． The results show that clarification request plus metalinguistic feedback is more effective than the other two types of oral CF( direct correction， prompt plus direct correction) ，and meanwhile indicate that English articles and prepositions have various cognitive properties．