Improper outcome evaluation is a concern, although self-directed learning plays a crucial part in English language acquisition. Both the design and the issue of self-directed learning in English cannot be solved by the conventional teaching methodology. So, to help students analyze their own English learning progress, this research suggests a constructive teaching approach. To minimize interference from independent learning, the learning platform is first designed using educational theory. Indicators are then segregated according to the needs of independent learning. The educational theory then develops an English language learning program based on independent study, and finally analyzes and synthesizes the findings. MATLAB simulations show that in the case of certain design standards, the constructive teaching mode for English the accuracy of self-learning and self-learning time are better than the traditional teaching mode.