In this study,we proposed a mobile APP-based system which integrates story-based animations and simulation quizzes for English learning.Users could interact with both components of the app.The story-based animation component provides the function of word/phrase reading which displays short animation clips.For the simulation quiz component,a number of simulated quizzes are presented.The app automatically displays the scores obtained upon completion of the quiz,and regenerates another quiz based on the students performance in the preceding quiz and the proposed boosting algorithm.To evaluate the effectiveness of the system,we conducted an experiment which compares the proposed system with traditional class-based learning.The results of the experiment show that the proposed mobile learning system yields superior scores to the control group.The results suggest the APP-based learning is helpful for students to improve their English skills.Statistical analyses demonstrate that the proposed APP-based system significantly outperforms the control group.Finally,the satisfaction survey also showed that users are highly satisfied with the mobile APP-based language learning system.