This paper describes the Ramdisk’s driver development based on WDM model. Its main function is in memory of the size distribution of the designated storage area. And through the establishment of a symbolic link to the system and the format for a virtual high-speed hard disks, to meet the high-speed data access needs. The procedures’s design and development used “Windows Driver Development Kit(DDK)” for develop tool,and based on WDM’s driver hierarchical structure. In this paper gives the driver a concrete realization, including the entrance drive, create and remove equipment IRP, a plug-and-play, power management, and the FAT file system driver structure in the method. The procedure in Windows XP through debugging environment, to achieve basic memory management functions.