The present invention discloses a wear leveling method; the method determines a pool mask for each physical block based on an erase number of each physical block. For different erase numbers, masks of the physical blocks are determined as cool pool mask CPM, normal pool mask NPM or hot pool mask HPM. When the pool mask of one physical block is changed from NPM to HPM, data of any physical block of which the pool mask is CPM is copied to the physical block of which the pool mask is HPM, and the physical block of which the pool mask is CPM is recycled as a garbage block. The present invention discloses a wear leveling apparatus, the method and apparatus can reduce additional wear caused by the wear leveling.