本文介绍了基于D12芯片的USB振动频率数据采集系统，并在pc机上进行频率分析。详细介绍了该系统的硬件软件设计思路和技术难点。该系统在实际应用中表现出很好的效果。关键词：USB；D12；数据采集；振动频率Abstract：In this article, author introduces to us a kind of data acquisition system for vibration frequency, and analyses the data in pc .The article explains the disposal design of hardware and software detailed ,and the keypiont in the technique. It gets a good performance in practical use.Key words: USB ; D12 ; Data Acquisition ; Vibration Frequency