English writing is a complex integrative process of comprehensive skills.A host of students are still unable to write a coherent English paragraph after having learned English for many years at school.To help college students improve their writing competence is a great challenge facing the English teaching in China.Researches on writing teaching method abroad have experienced prosperity.In China,however,researches in this field are far behind.There is great need to search for more efficient writing instruction model so that it can serve well in Chinese context.Enlightened by Krashen’s input hypothesis and Swain’s output hypothesis,the writer put forward Reading-Based Writing Instruction Model.This paper aims to discuss the effectiveness of this model from the different perspectives. English writing is a complex integrative process of comprehensive skills.A host of students are still unable to write a coherent English paragraph after experiencing learned English for many years at school.To help college students improve their writing competence is a great challenge facing the English teaching In China.Researches on writing teaching method abroad have experienced prosperity.In China,however,researches in this field are far behind.There is great need to search for more efficient writing instruction model so that it can serve well in Chinese context.Enlightened by Krashen’s input hypothesis and Swain’s output hypothesis, the writer put forward Reading-Based Writing Instruction Model. This paper aims to discuss the effectiveness of this model from the different perspectives.