Abstract: In order to implement precise collection and scientific analysis of geometric parameters of railway catenary during installation, fine-tuning, and operation periods, this paper designed and developed a catenary geometric parameter detection system. It used technologies such as laser measurement, blue-tooth transmission, and statistical analysis to collect, record, transmit, summarize, and analyze the geometric parameters of the catenary, formed a digital asset of the geometric parameters of the catenary. The application shows that the system has good practicality and reliability, and can provide efficient and intelligent detection technology support for the installation and commissioning of railway engineering catenary.