本文分析了一种20MeV电子直线加速器中的温度场分布，查明了目前所用具体结构与恒温冷却方式（U形水冷系统）的质量水平，并与国外某些加速器所用的单向流动冷却方式在优缺点方面作了对比。

This paper discusses the temperature distribution in the accelerating structure of a 20MeV electron linac designed for medical use. An examination is made of the quality of the concrete structure and the cooling mode (of U-type) adopted in this linac. On the basis of the formulas of temperature distribution drawn from the discussion

a comparison concerning effect is given between two cooling modes

the U-type mentoned above and the unidirection flow type as adopted in some other linacs.