The present invention discloses a flash file system and drive method thereof, characterized in that, after reception of an access function, it verifies the parameters in the access function and analyzes the file name of the file to be accessed included therein, then queries the starting position of the file to be accessed, and finally controls a physical driver module to access data from the flash according to the starting position and such parameters. The flash file system according to the present invention does not require FAT (File Allocation Table) file system and block interface, thereby simplifying the complexity of file system and enhancing system performance.