An SCSI (small computer system interface) driver automatic generator has been developed for developing SCSI drivers efficiently. The generator can automatically maintain SCSI subsystem code, generate most driver modules, package, and provide drivers under the master and slave running modes. In this paper, the authors present the automatic generator's design method, system control flow, data flow, system modules and hierarchy, interface and running processing. The paper describes in brief the system implementation, including the module management, automatic packaging, and model generation.