The research analyzes the Yi language grammar plays an important role in English grammar learning. So the contrastive analysis between the Yi language grammar and English grammar has a great meaningful guidance. That is, through the contrastive analysis, the Yi students＇ learning difficulties and easiness in learning English grammar can be predicted. The contrastive analysis teaching model and error analysis teaching model can be helpful in teaching the Yi students＇ learning difficulties, and the two teaching models will be applied in Yi students＇ English grammar teaching and test.