油朴（Ｃｅｌｔｉｓｗｉｇｈｔｉ）为榆科常绿大乔木，是一种很有价值的油料植物。它在中国仅产于西双版纳，并几乎只生长在石灰岩山森林群落中，而常为该森林群落的建群树种。根据野外调查及萌发裁培试验，我们从生物学、生态学及种群等方面对它进行了分析研究。并且，为了探讨油朴与石灰岩山钙基质的相关性，我们在种子萌发及幼苗生长试验中，均采用了不同土壤基质，对它们进行了对比分析研究。在其种群的调查中，对株高５ｍ以下的幼苗、幼树及株高５ｍ以上的成年大树均进行了样方调查及高度级统计分析。初步总结了这种植物种子萌发的特性；幼苗生长的规律；种在石灰岩山森林分布的一般规律及它们在各群落的种群结构状况等。通过本文，基本上可了解油朴在西双版纳的生长、分布规律及生态、种群等方面的有关问题 Celtiswighti, an elm evergreen tree, is a valuable oil plant. It is native to Xishuangbanna only and grows almost exclusively in limestone forest communities, often as a flock of tree species. According to field investigation and germination cutting experiment, we have carried on the analysis research to it from biology, ecology and population. In addition, in order to investigate the correlation between oleoresin and calcium matrix in limestone, we used different soil matrices in seed germination and seedling growth experiments, and compared them. In its population survey, quadrats and height-level statistical analyzes were conducted on seedlings, young trees below 5m height and adult trees above 5m tall. The characteristics of seed germination, the rules of seedling growth, the general rules of species distribution in limestone forests and their population structure status in each community were summarized. Through this article, we can basically understand the growth, distribution and ecological, population and other related issues of oil plant in Xishuangbanna