For the loom production management in textile enterprises is lack, and data collection of the looms production process need solve, then textile industry requires the automation of data management, then a card read-write facility has been developed based on USB. The paper introduces the process that Card uses the bus to read and write, and demonstrates the communication process between USB bus and personal computer. It is found that the communication method can obviously improve the speed of data gathering between computer and Card, which guarantees the reliability and stability of system.