彭曼公式考虑因素,成果较准确。利用河北省(?)城试验站资料进行的计算表明:计算值与试验值相比,误差在±5％以内。针对原彭曼公式计算过程繁琐的缺点,对其进行了某些修正,文中将考虑昼夜气候条件影响的修正系数C与作物系数K_c,综合为一个改正系数K,并给出了冬小麦各生育阶段的K值范围。 Peng Man formula to consider the factors, the results more accurate. The calculation based on the test data of Hebei Province (?) Urban Station shows that the calculated value is within ± 5% of the experimental value. For the shortcomings of the calculation process of the original Penman formula, some modifications were made to it. The correction coefficient C and the crop coefficient K_c, which are influenced by the diurnal and climatic conditions, will be taken into account in the paper, which will be combined into a correction coefficient K, K value range.