《周易参同契》是汉代一部炼丹著作,炼丹的三大要素、丹理与表达载体,均选择“易”是依据实际出发而产生的需要。炼丹所需之物的命名、性质标示,炼丹过程的药理反应,时辰拿捏,共同构筑成一个庞大的以衍“易”为载体的系统。《周易参同契》的炼丹术於道教史、易学史上都具有一定的价值和意义。 “Yi Yi ginseng contract contract” is a Han Dynasty alchemy works, alchemy of the three elements, Dan and expression vector, choose “Yi ” is based on the actual needs arising out of. Alchemy needed for the naming of objects, the nature of the symbol, the alchemy reaction to the process of pharmacology, when the time being taken together to build a large to Yan “Yi ” as the carrier system. Alchemy of Zhouyi Participation in Alchemy of Taoism history, history of Yi learning has a certain value and significance.