Objective] The aim was to investigate the tree-crown structure characteristic of Shixia longan airtight orchard.[Method] The in-vestigation of the tree-crown structure of Shixia longan airtight orchard was done, and the basic characteristics of canopy structure and related parameters was obtaind.[Result] The study showed that the plant and row space was 4.36 m ×5.62 m, tree height was 3.50-5.40 m and average was 4.76 m, tree-crown height was 3.14 m, vertical crown breadth was 6.82 m, lateral crown breadth was 6.03 m, the average of vertical cross length was 2.46 m, the average of lateral cross length was 0.41 m.The tree-crown of one single plant was round and the plants in the same line connecting into an integrative body which make the “hedgerow” structure.There was one main trunk and the average perime-ter of it above 10cm to the ground was 72.4 cm, it also had 2 to 4 main branch and its perimeter was 65.4 cm.The average of branching de-gree was 13.2, the volume of leaf layer was 15.77 m3 and the bare chamber was 7.84 m3 , the relative intensity in chamber was 12.7% and the relative intensity between plants was 18.6%.The canopy coverage rate was 73.96%, leaf horizontal density in the garden was 13.31, leaf area index was 11.60, the rate of tree-crown was 48.87% and the production volume coefficient was 66.79%.[ Conclusion] The research provide the reference for crown shaping and enclosed modification of of Shixia longan airtight orchard.%[目的]调查石硖龙眼密闭果园树冠结构特征。[方法]对广西钦州市浦北县张黄镇福山村委大岭村石硖龙眼成年树树冠结构进行调查，了解石硖龙眼成年树失管后密闭果园树冠结构的基本特征及其有关参数。[结果]株行距4．36 m ×5．62 m，树高3．50～5．40 m，平均4．76 m；树冠高3．14 m；株向冠幅6．82 m，行向冠幅6．03 m；株间平均交叉长度为2．46 m，行间平均交叉长度0．41 m；单株树冠形状为圆头形，同一行植株的绿叶层连成一整体，形成“树篱形”结构；主干1条，离地面10 cm处主干平均周径为72．4 cm，主枝2～4条，主枝平均周径为65．4 cm；分枝级数平均13．2级；绿叶层体积15．77 m3，内膛光秃体积7．84 m3；内膛相对光强12．7％，株间相对光照18．6％；叶幕覆盖率为73．96％，果园的叶平面密度13．31，叶面积系数11．60，冠高率48．87％，生产容积系数66．79％。[结论]该研究为失管低产的密闭龙眼果园进一步开展树冠整形、密闭改造提供参考。
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