The invention discloses a method and a system for realizing a database service. The invention relates to a virtualization platform technology, which solves the problem of lack of a mechanism capable of providing database services on a virtualization platform. The method comprises: uploading at least one self-defined database mirror; registering the database type and version of each database mirror; a cloud host being created, and the database mirroring being loaded through the cloud host to provide a database service. The technical proposal provided by the invention is suitable for cloud computing data management, and realizes the improvement of the utilization rate and the utilization rate of the physical resource equipment.