Embodiments of the present invention disclose a data migration method and apparatus that are applied to a name node. The method comprises the steps of acquiring a first storage policy and read frequency of destination data; determining a destination read frequency range of the first storage policy, and determining whether the read frequency is within the destination read frequency range; and if not, determining a second storage policy according to the read frequency, modifying the first storage policy to the second storage policy, and migrating the destination data according to the second storage policy. Through adoption of the data migration method and apparatus, hadoop distributed file system (HDFS) resource utilization is improved.