In recent years, environmental issues have received more attention. Good environmental protection measures can ensure the sustainable development of large sites. Based on this, through the analysis of the environmental phytoremediation of Weiyang Palace Site in Han Chang’an City, this paper summarizes the current status and problems of large sites in greening conservation work, and conducts the explorations of the related problems in the large site protection projects combined with the historical style and ecological environment conservation strategies. In this way, when the large sites are conserved effectively, it can promote the economic efficiency and play an important role in the heritage building of Silk Road.%近年来，大遗址的环境保护问题已经受到了越来越多的关注，做好环境保护措施才能保证大遗址的可持续发展。基于此，通过对汉长安城未央宫遗址的环境植物修复案例的实践分析，对大遗址进行的绿化养护工作的现状及出现的相关问题做了简要的总结概述，并结合遗址的历史风貌、生态环境恢复策略及国内一些大遗址保护项目实施过程中的相似问题进行了有效的探讨，使大遗址在被有效地保护利用的同时，能够保证相应经济效益的提高，使其在“丝绸之路”遗产建设上发挥重要的历史文化作用。
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