The invention discloses a method and system for reducing the rblock capacity in a solid-state hard disk, and relates to the technical field of solid-state storage. The method includes the steps that the number of Dies of which a rblock is composed is reduced; the Dies removed from the rblock is correspondingly combined with the remaining Die to form a VDie; storage blocks Block in the VDie are numbered again. The system includes a Die reducing module, a VDie newly forming module and an rblock increasing module; the Die reducing module is used for reducing the number of the flash-memory bare chips Die, the VDie newly forming module is used for making Dies removed from the rblock correspondingly combined with the remaining Die to form the virtual flash-memory bare chip VDie, and the rblock increasing module is used for numbering the storage blocks Block in the VDie again. The method and the system solve the problem that the rblock capacity is extremely large and brings negative influences on the performance and data security of the solid-state hard disk, and by reducing the rblock capacity, the whole performance and data security of the solid-state hard disk are improved.