The paper introduces the comparative measurements of CNNC Radiation Metrology and Measurement Center and RI_CN-NIM for tritiated water activity.The structure and electronics circuit of liquid scintillation TDCR devices are described in detail.Comparison methods, results and uncertainty assessment are described. The experiment results verify the consistency of two systems.The activity determined with TDCR by two labora-tories is in agreement within the range of 0.24%.%本文介绍了国防科技工业电离辐射一级计量站与中国计量科学研究院电离辐射所进行的氚水比对实验。详细说明了比对采用的2套液闪TDCR装置的结构以及电子学线路组成。对比对方法、比对结果以及不确定度评定进行了说明。通过比对室验，验证了2套TDCR装置测量结果的一致性。比对结果表明，国防电离辐射一级计量站与中国计量院电离辐射所氚水比活度测量结果偏差为0．24％。
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