克拉申的第二语言习得理论是英语教学语言设计的理论依据。通过调查和实验研究可得出以下结论:母语对第二语言的教学效果具有至关重要的影响;大学生在学习外语的初级阶段,教师使用50%的英语语言输入比例是适宜的,一旦进入了语言的适应期,教师就应调整英汉输入的比例。从长远看,70%比例的英语语言输入是比较合理的。随着时间的推移,英语语言输入的比例还可适当加大。 Krashen’s second language acquisition theory is the theoretical basis of English teaching language design. Through the investigation and experimental research, the following conclusions can be drawn: mother tongue has a crucial influence on the teaching effectiveness of second language; when the students learn the foreign language in the initial stage, it is appropriate for the teacher to use 50% of the English language input ratio, Language adaptation period, teachers should adjust the ratio of English input. In the long run, 70% of the English language input is more reasonable. As time goes on, the proportion of English language input may be appropriately increased.