A data management for a flash memory device is disclosed. The device includes a screen virtual sector table and a virtual unit versus physical unit table (V2P table) for each block. With the auxiliary of the screen virtual sector table and v2p table, the data programming into the target block of the flash memory is in accordance with the data receiving order, which is from lower page number to higher page number in case the target block is free. The data can be written into the target block contains data already through one or two temporal block(s). The conventional LBA data transfer protocol can still be applied to the flash memory device of this invention.