FTL is used to emulate a flash memory as a standard block device via hiding the erasebeforewrite characteristics of the NAND flash. As conventional FTLs slow the initialization by scanning the spare area of blocks to build mapping tables, and implement address translation with a single mapping table, they can only improve space utilization partially, some of which even increase the block recycling cost and debase the operating efficiency.In this paper, an idea of funtion table is proposed to build the block mapping table and block information by the status table, which accelerates the mounting speed, and decreases the space complexity as well.Meanwhile, the mapping table is combined with the block information to achieve fast addressing in reading and writing, and also balances the space utilization and the recycling cost.