Modern technology played a major role in the development of interior design, which necessitated the need to study the impact of the application of new in this field on theories and concepts of interior design. In this research, a study and analysis of the impact of the application of mobile interior design technology on one of the most important design theories is "functional theory". And through the work of an analytical study of the fundamentals of functional theory applied in traditional housing and other applied in housing that applies mobile technology. Through the comparison between the two cases, the study concludes that there are new standards and basics - especially with regard to the ergonomic side - where we develop a new classification for the types of movement corridors as well as for the types of functional spaces, and an analytical study of the areas determined by the traditional standards and accepted in the functional theory of each space is being done. According to his activity, the same is true for moving housing with technology, and through comparison between the two studies we conclude new dimensions and measures of functional spaces in the moving housing.