Cache system of Not AND (NAND) flash memory and cache method

The invention discloses a cache system of a Not AND (NAND) flash memory, comprising a two-level Hash storage module 101, a read-write interface module 104, a page data cache organization module 102 and a block data cache organization module 103, wherein the page data cache organization module 102 and the block data cache organization module 103 are both connected with the two-level Hash storage module 101 and the read-write interface module 104; the two-level Hash storage module 101 is used for recording data stored in the cache; the page data cache organization module 102 is used for organizing a page data cache queue in the cache; the block data cache organization module 103 is used for organizing a block data cache queue in the cache; and the page data cache organization module 102 and the block data cache organization module 103 read and write the data in a flash memory by the read-write interface module 104. By the system and the method of the invention, the adaptability and availability of the cache system on a file system are strengthened.