Abstract: This paper briefly analyzed the various modes of current urban rail transit cloud platform construction, and pointed out the urgent need for cloud-based services of many urban rail transit lines in China, proposed a progressive cloud migration scheme of urban rail transit business system migrating to cloud platform. The paper described the method, the evaluation process and the progressive strategy of production business migration to cloud platform. This strategy was used to illustrate the implementation of progressive urban rail cloud migration scheme and architecture based on business and data to realize the cloud migration of urban rail business system and data.