本文提出在测长机上进行精密测量时,由于机身温度与被测件温度不相等所产生的测量误差,可以用文中所给公式计算出热变形误差来予以修正。如果这一方法确实可行,无疑对于缩短仪器与被测件的等温时间从而提高测长机的使用效率是很有用处的。我们希望读者从理论和实践两方面对这一问题作进一步研究探讨。 In this paper, the measurement error caused by the temperature difference between the body temperature and the temperature of the DUT when the precision measurement is carried out on the length measuring machine can be corrected by using the formula given in the paper to calculate the thermal deformation error. If this method is indeed feasible, it is undoubtedly useful to shorten the isothermal time between the instrument and the DUT so as to improve the efficiency of the length measuring machine. We hope that readers will further study this issue both in theory and in practice.