1. A method for implementing memory migration, comprising: migrating, data in a memory to be migrated to a first unusable memory of an operating system of a computer, by a basic input-output system of the computer, when the memory is migrated; wherein the first unusable memory is converted in advance from an original usable memory of the operating system, wherein the original usable memory is a memory set as reserved for the operating system, and unmodifiable by and inaccessible to the operating system; and storing, by the basic input-output system, a mapping relation between a physical address of the memory and a physical address of the first unusable memory.