Through the scientific evaluation and analysis of the modular design of Motorola mobile phone, the application and development of modular design idea in the mobile phone field plays a reference and inspiration role, and promote the innovation and diversification development of the mobile phone market. Taking Motorola mobile phone modular design as the research object, the evaluation indexes are selected based on emotional design theory, and the weight and user satisfaction of each evaluation index are obtained by combining expert scoring and user research method. The evaluation results of each evaluation index in the modular design are calculated by fuzzy analytic hierarchy process. In the modular design of the various functions of Motorola mobile phone, the morphological characteristics of the instinctive layer, the functional characteristics of the behavior layer and the interactive characteristics of the reflective layer are the most successful, which can be used as a reference for the modular design in the development of mobile phone innovation. However, the score of texture, texture and emotional characteristics is low. There is still room for improvement in the follow-up design.