A gas-liquid two-way automatic switching device was designed .Based on the device ,the vol-ume of micro loop could be automatically calculated by using intelligent electronic weighing scales method . The result was consistent with the theoretical value .%设计了一种气液双路自动切换装置，研究了微量定量环体积的测试方法。结果显示，气液双路自动切换装置能准确将定量环中纯净水切换出来，再利用智能电子天平称重法自动计算定量环定量体积，测定结果与理论值基本一致。
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