The methord of extraction of essential oil from elm money uesd steam distillation and cyclohexane to capture distillate of content, simultaneously, the factors of the distillation time, solution pH and extraction solvent were considered in this research. There are more than 20 compounds in the essential oil. 17 of the compounds content are higher, the rest of them are low. The best distillation pH is 5~ 6,the best distillation time is 4.5 hours, cyclohexane is better than ether. Essential oil to the blocking role NDMA can reach 54.43%, to NaNO2 clearance can reach 59.27%. Through the further search to elm money not only can improve making use of a pais of existing resources capability, but also reduce environment press, particularly can make the mankind be subjected to a benefit in the living environment and hold healthy.%文章采用水蒸气蒸馏,环己烷捕集馏出物的方法提取榆树钱中的精油,研究了不同的因素,蒸馏时间、溶液pH、萃取剂等对所得精油量的影响.实验中,最佳蒸馏pH为4～5,最佳蒸馏时间为4.5小时,而且,环己烷萃取效果比乙醚的效果好.精油对NDMA的阻断作用最高可达54.43％,对NaNO2清除率最高可达59.27％.通过对榆树钱成分的进一步研究可以提高对现有资源的利用能力,减少环境压力,尤其是可以使人类在生活环境和保持健康方面受益.
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