<正>针对具有湿润海洋性气候特征的江苏北部沿海，从蒸发过程的物理机理出发选用适宜的蒸发量计算方法，获得防护林区域１９７４～１９９１年月蒸发量的连续序列资料。通过有林区与无林区月蒸发量的时、空对比分析，得到随着林木的生长成林对蒸发影响的变化，肯定了苏北沿海防护林体系调节气候的积极效应。

In this paper, a series data of monthly evaporation (1974～1991), in Jiangsu province’s northern coastwise protective forest system which has the characteristics of moist maritime climate, are calculated by appropriate method from the physical regularity in evaporating. Then, according to the analytical results of monthly evaporation by comparing in shelter belt region with in other regions both on time and space, the variation of effects on evaporation according to growing of forest is obtained and it is confirmed that Jiangsu province’s northern coastwise protective forest system has an active effect on regulating the climate.