The invention discloses a system and method for integrating a memory with a nonvolatile memory layer and storing a hierarchical structure in a computer system. In one embodiment, a PCMS memory deviceis used as a layer in the hierarchical structure, and can be called as a remote memory. A high-performance memory device (such as a DRAM) is put in front of the remote memory, is used for sheltering apart of performance limit of the remote memory, and can be called as a near memory. In one embodiment, the near memory is configured to work in a plurality of different operation modes which comprise(but not limited to) a first mode and a second mode; in the first mode, the near memory is used as a memory cache of the remote memory to carry out operation; in the second mode, a first address range of a system address space is distributed to the near memory and a second address range of the system address space is distributed to the remote memory; and the first range and the second range express the whole system address space.