为了研究常绿阔叶林小流域的水分平衡，我们在江西九连山区进行了３ａ林外雨量、林内雨量和树干流量的观测，并据此进行了年林冠截留量的估算。观测结果表明，林冠截留率由一次降雨量为０．４～１ｍｍ的７８．１％逐步降低到一次降雨量为６０ｍｍ的３．４％～３．６％。一次降雨量大于６０ｍｍ时，林冠截留率基本稳定在这一百分数。１９８８、１９８９和１９９０年３ａ的年降水量在１７１８．５～２１１６．５ｍｍ之间。估算结果表明，年林冠截留量在３００～３４０ｍｍ之间，约为年降水量的１６％～１７．５％。 In order to study the water balance of the small-scale evergreen broad-leaved forest, we measured the rainfall outside the forest, the rainfall in the forest and the trunk flow in the area of ​​Jiulian Mountain in Jiangxi Province, and then estimated the annual canopy interception. The observation results show that the canopy interception rate is gradually reduced from 78.1% of a rainfall of 0.4 ~ 1mm to 3.4% ~ 3.6% of a rainfall of 60mm. A rainfall greater than 60mm, the canopy retention rate basically stable at this percentage. The annual precipitation in 1988, 1989 and 1990 3a was between 1718.5 and 2116.5 mm. The estimation results show that the annual canopy interception is between 300 and 340 mm, about 16% to 17.5% of annual precipitation.