This paper aims to study the application of HAAT model in the design, put forward the corresponding design strategies and methods, and provide theoretical guidance and practical reference for the design of communication aids for the elderly with Broca’s aphasia. Taking the elderly with Broca’s aphasia as the research object, the basic theory and conceptual framework of HAAT model were introduced, from the point of view of design, the scope convergence and directional expression of the four core elements of the model were carried out, focusing on the relationship between the three elements of “the elderly with Broca’s aphasia” “communication task” “usage situation” and “communication aids”, the design strategy of communication aids based on HAAT model was proposed.By using design strategies to design and practice, an APP for elderly communication aids “Xin Yu” was produced, which met the communication needs of the elderly with Broca’s aphasia and obtained a good user experience. HAAT model is applied to the design of communication aids for the elderly with Broca’s aphasia, which has strong operability, effectiveness and applicability, and provides a new direction for the research and development of communication aids design in China.