This paper discusses temperature extrema of an ideal gas which appears as a circle in a p V diagram . The highest and lowest tem peratures turn out to be dependent on the ratio between the coordinates and the radius of the circle .When this ratio a ≥ 2 ,the highest and lowest tem peratures correspond to the two points that are furthest from and closest to the origin of coordinate ,respectively .When a < 2 ,two maxima of different temperatures and two minima of same temperature appear on the circle .The locations of the two minima are sym metrical about the line p = V and depend on the value of a .%本文讨论了在 p V 图上圆形循环过程的理想气体的温度极值问题。结果显示，循环过程中的最高及最低温度和圆心坐标与圆的半径的比值有关。当该比值 a ≥2时，循环过程中的最高及最低温度分别位于圆上离开原点最远和最近的点；而当 a ＜2时，圆上会出现两个温度不同的极大值及两个温度相同的极小值，且两个温度极小值关于 p ＝ V 直线对称，其具体位置与 a的大小有关。
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