Data migration method in tiered storage system in cloud computing environment

Disclosed is a data migration method in a tiered storage system in a cloud computing environment. The tiered storage system comprises an on-line service platform and a big data platform, and data comprises structured data and unstructured data, and migrates between the on-line service platform and the big data platform. The method comprises: determining a type of data under migration; and migrating between the on-line service platform and the big data platform according to the type of the data. When it is determined that the data under migration is the structured data, parallel migration is implemented by using the MapReduce architecture; and when it is determined that the data under migration is the unstructured data, parallel migration is implemented in an FTP manner.