Based on the study of micro-interaction principle and interaction design language principle, this paper proposes an application approach of the interaction design language in the mobile environment.With the development of the Internet product market, the demand for micro-interaction design is also increasing. Micro-interaction is no longer limited to the details of practical implementation but has developed into an interactive design approach and even interactive design thinking. At present, there is no unified regulation and application approach for the definition and working approach of micro-interaction. That has a lot to do with the disciplinary characteristics of interaction design itself: Without the support of basic theory; The approach and processes of interaction design are more derived from the practical approach and design practices of other disciplines. The interaction design language is a kind of language and theoretical basis, especially born for interaction design. It disassembles interaction design behavior into behavior elements and conducts collocation and combination to analyze interaction behavior or create new interaction ways. However, there are not many types of research on how to combine interaction design language with practical work. Therefore, the practical approach of micro-interaction can be explored and developed by using the characteristics of interaction design language theory. How to develop the application approach of interaction design language and how to develop a flexible process of micro-interaction design are worth studying and discussing.Based on this problem, this paper further discusses the interaction design and micro-interaction principle and points out the knowledge transformation between the existing interaction design disciplines in design learning and design practice. By reclassifying interaction design models and combining the principles of interaction design language, a new microinteraction design process is proposed. Besides, the application approach combining interaction behavior design layer with interaction design language is developed in this process to sort out and organize the design approach of micro-interaction behavior layer.This paper presents a new possibility for the research and application of interaction design by observing micro interaction from macro to micro perspective. Through actual experimental data and case study, this paper verifies that this approach can produce a better micro-interaction design scheme. Based on the principle of this design approach, new interactive design tools, such as card tool and interactive prototype, can be derived in future work. Through these tools and approaches, the quality and efficiency of the creative output of interaction designers can be improved.