Abstract: For improving the storage of loomage′s parameter,various data storage methods at present were analyzed and compared with each other,and a way based on USB was put forward.This article introduced the control system of loom and the hardware design of the USB module,listing the control system′s module map and the SL811HS′s schematic,expatiated the software design of the USB host system,which includes initialization of SL811HS,enumeration of USB equipment,the protocol of Mass Storage and FAT document system.This design utilizes the S3C4510B′s rich resources,also considers the characteristics of the SL811HS,and accomplishes the USB module in the control system of loom.