The invention discloses a data storage method and a data storage system. The method is applied to the data storage system which comprises an access layer, a distribution layer and a core layer. In the method and the system provided by the invention, an upper-layer server obtains storage data from lower-layer storage equipment in an active obtainment mode according to a preset policy, can firstly scan the storage data according to the preset policy and then stores the storage data so that the acquiring and the processing of the stored data become more flexible.