MOBA e-sports (Multiplayer Online Battle Arena e-sports) is rapidly popularizing and entering explosive development. It is very important to analyze the reasons for successfully attracting such a large number of users to play such games. The main objectives of this paper are to obtain design features of MOBA games on mobile devices, and to find the weight relationship between various charm elements. The Miryoku Engineering and Quantification Theory Type 1 are used in the whole research process. This study uses EGM method as a semi-structured interview method to conduct in-depth interviews with 8 highly involved users of mobile MOBA games. In the second stage, this study obtains the importance data of users to the design elements through the distribution of questionnaires. Finally, the quantitative relationship between design elements and users' psychological perception is established by using QTT1. The research results analyze the charm elements of mobile MOBA games. It contains four kinds of abstract reasons and the weight relationship between the original reasons and specific design elements. The author's findings can provide important information for mobile MOBA game product development.