This paper conducts an in-depth study on the design theory and practical application of intelligent building electrical systems. It first elaborates the significance of this research within the contemporary context

highlighting that under the dual impetus of the strong support of technologies such as the IoT and big data

as well as the continuous upgrading of people's escalating demands for building comfort and energy efficiency

intelligent building electrical systems have become an inevitable trend in industry development. During the research process

the study comprehensively summarizes achievements in design and application while identifying limitations such as insufficient exploration of emerging technologies and limited case coverage. Furthermore

it looks forward to the future development directions including technological integration

expanded case studies

and standardization improvements

providing theoretical guidance and practical references for the field of intelligent building electrical systems.