通过改进原有的实验仪器，设计一个拉脱法测量液体表面张力系数的新实验.从金属环片受力分析开始，推导测量 液体表面张力系数的计算新公式，纠正了一直以来不计液膜重力的过于粗略的计算方法.实践证明该实验测量方法操作方便， 测量过程稳定，重复性强，数据精度高.并对新的实验结果进行准确分析，澄清了有关文献中错误的概念.

A new method for measuring coefficient of surface tension of liquid is designed by improving equipment of the experiment. New calculation formula is proposed based on force analysis of the metal ring. It corrects the used rough method which ignoring the weight of liquid. This new method has easy operation，and experiment data show that it has high accuracy and good stability. By a careful analysis of the new experimental results， some mistakes in related literatures are corrected.