In order to study the effect of bushing on the triple point of water( TPW),the thermometer well which have diameters of 16 mm and 18mm respectively are developed,and the bushing with diameter of 15. 5 mm. The resistance of the standard platinum resistance thermometer in the well with bushing and without bushing are measured,by the AC bridge which the accuracy is 0. 02 × 10-6 . The experiment results indicated that the bushing have little effect on the value of TPW,less than 30 μK. Additionally,under the same conditions,the more uniformity between the diameters of bushing and thermometer well,the less influence on the values of TPW.%为了研究套管对水三相点的影响，研制了计阱内径分别为16 mm和18 mm的水三相点容器以及直径为15.5 mm的套管。通过在计阱内加套管和不加套管，并利用准确度为0.02×10-6的交流比较仪电桥测量标准铂电阻温度计在计阱内的电阻值，比较不同直径水三相点容器内套管对水三相点的影响。实验结果表明：实验中套管对水三相点值的影响小于30μK，且在相同的测量条件下，套管的直径与水三相点容器温度计阱的内径越接近，套管对水三相点值的影响越小。
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