Abstract: With the continuous development of social economy and rapid development of computer technology, the digital development of construction engineering through modeling has become the main development direction of engineering practice. The application of this method in subway engineering can be used for subway construction and future development. Provide scientific guarantee. In the construction of subway electromechanical installation, technical quality will directly affect the overall quality of construction. Based on this, this article analyzes the application of BIM technology and key technologies in subway electromechanical installation and construction, in order to promote its better application and improve the level of subway construction in my country.