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In this paper, a High-Speed USB implementation in the Data Acquisition Unit intended for a Reversed Field Pinch (RFP) experiment device Keda Torus eXperiment (KTX) is presented. An ultra-large amount of data transfer is a key problem in Data Acquisition System for KTX. A prototype of KTX with 64 channels was designed, sample rate of which is 16ksps and data length 24bits. High-Speed USB interface implemented in our design assure fast enough data transmission between the Data Acquisition Unit and Workstation. The CY7C68013 chip of CYPRESS Company was used as the USB interface controller. The software was developed on workstation for testing. Transmission speed is tested based on the prototype, and we find that the stable speed of USB2.0 transmission can achieve 123Mbps.