通过对林木树冠之间重叠的分析，提出了关于树冠重叠的概念和类型．并利用积分方法，推导出了林木树冠发生重叠时的重叠面积和重叠率的计算公式。以树冠冠形在水平面上的投影呈圆形为实例、说明了公式的应用方法和计算过程。结果表明、树冠重叠的理论基础是严紧的、计算方法也便于应用。 Through the analysis of the overlap between tree canopies, the concept and type of crown overlap were proposed. And by using the integral method, the formula for calculating the overlap area and overlap rate when the tree canopy is overlapped is deduced. The projection of the canopy crown on the horizontal plane is taken as an example to illustrate the application of the formula and the calculation process. The results show that the theoretical basis of crown overlap is tight, and the calculation method is also easy to apply.