This paper adopts the 2013 China Education Panel Survey (CEPS) data and uses STATA to analyze them in order to study the impact of junior high school students' Chinese and mathematics academic grades on their English academic grades. Cognitive ability test standardized score(based on 3PL model) had the highest correlation with English academic grades and had the greatest impact on it

greater than that of math and Chinese academic grades and students' emotional engagement in learning. Secondly

students' academic grades in mathematics and Chinese as independent variables

English academic grades as the dependent variable

and students' emotional engagement in learning based on the questionnaire information were established as control variables together with students' standardized scores on the cognitive ability test

and regression equations were carried out to test the results. The results found that Chinese academic grades have stronger explanatory power for English academic grades compared to junior high school students' math academic grades. Students' academic grades in mathematics and Chinese can directly affect their English academic grades

and can also indirectly affect it through the mediation of students' cognitive ability.