The development of Internet of things technology and digital technology has spawned the demand for digital transformation of electric power emergency rescue facility management and control. In the development of such targeted products with clear functions, it is more necessary to reduce the subjective deviation of sub-function evaluation, rationally and scientifically evaluate the importance of each sub-function, and finally guide the R & D investment. With the digital network access transformation of electric power emergency rescue facilities as the practice object, the UXM-FAST-AHP analysis model was built. The ideal use scenario was analyzed and built with the "original + expected" user journey comparison diagram. The target function structure was built through the function analysis technology. And the subjective evaluation deviation was reduced through the pairwise comparison matrix and analytic hierarchy process based on sub-function clustering. The importance of each sub-function was analyzed, and then guided to design and investment. The UXM-FAST-AHP analysis model can also realize clear and reliable logical analysis in the R & D process of the established target products, and effectively help sort out and evaluate the design focus in development of the established target products.