Big data, cloud computing, mobile Internet and other new industries and technologies are changing the traditional survey, design, engineering construction management and maintenance mode.At present, the design phase of rail transit engineering industry has basically achieved digitization, but in some aspects, the data management and processing capacity still need to be strengthened. The design results have not been fully applied due to the means and capacity constraints of data management and processing in construction and operation. This makes it difficult to realize in integration and information sharing in the whole life cycle of engineering, which restricts the development of rail transit informatization. It is one of the key issues for the rail transit engineering informatization to study and use big data and cloud computing technology among a mass of information and data. It is only recently that big data and cloud computing technology are studied in the field of rail transit engineering, and therefore it is important to know in what aspects of the whole life cycle these technologies can be used. Based on the characteristics of big data and cloud computing, this paper analyzes the application requirements of rail transit engineering project in planning, design, construction, operation and maintenance, and the object is to provide reference for future research.

"Digital Line Selection Platform in Design Phase of Railway" is an integrated design platform for railway line selection. On the railway line pre-feasibility study stage, a 3D line selection platform was established based on Digital Earth. Taking full advantage of Digital Earth's global digital terrain and high-definition video, it completed route planning and design. In the feasibility study and preliminary design stage, a generation line interactive visualization CAD systems was developed based on digital topographic maps and CAD. It can be used to complete the design, multi-line hub Line Plane design and Interchange transverse channel design, which covers various electoral line railway line digitization of content design. This article described the background, function and application of the application platform development and focused key technical issues in the development.