At present, traditional processing and installation methods are mostly adopted in ventilation project construction. However, the overall quality of installation is not only affected by scattered location, but also susceptible to artificially technical ability. The semi-finished products and finished products are prone to quality problems by low processing production efficiency and non-uniform accuracy, what's more, placing points position in installation process is not accurate, which results in deviation. This paper studies on 13 metro stations in Kunming Metro Line 4, and elaborates the air duct processing and installation by using CNC machining equipment, robot wiring equipment and linking data from BIM model. With the aid of the integrated approaches and informationization, the project construction aims to automation, standardization, improving the efficiency and accuracy of air duct processing and installation and improving the system of industalization, meanwhile, as well as reducing labor costs and material loss. By integrating BIM technology with the prefabrication and intelligent installation of ductwork, it can accelerate the overall construction progress of ventilation projects and further enhance the quality of the project.