With the expeditious development of the 4.0 technology era, learning English in non-English speaking countries is more crucial and meaningful than ever. Thus the application of information technology for teaching has been increasingly focused and interested, particularly the application of m-learning to support teaching and learning is also progressively popular. Following this trend, this paper conducts to build the application of learning Mathematics by using the English language for the primary object of Students of Mathematics Teacher Education through three steps: First of all, survey the need for studying Mathematics by using English language and analyze the factors of the affecting to students' English proficiency. After that, plan and design an application for teaching Mathematics by using the English language. Finally, experiment and get opinions. The results obtained in the study show that learners who receive this application are quite positive.