天然药材的分布和生产离不开一定的自然条件。各种药材的生产，无论品种、产量和质量都有一定的地域性。所以自古以来医家非常重视道地药材。所谓道地药材，又称地道药材，是优质纯真药材的专用名词，它是指历史悠久、产地适宜、品种优良、产量宏丰、炮制考究、疗效突出、带有地域特点的药材。如甘肃的当归，宁夏的枸杞，青海的大黄，内蒙的黄芪，东北的人参、细辛、五味子，山西的党参，河南的地黄、牛膝、山药、菊花等
The distribution and production of natural medicinal materials are inseparable from certain natural conditions. The production of various medicinal materials, regardless of variety, yield and quality, has certain regional characteristics. So physicians have attached great importance to genuine medicinal materials since ancient times. The so-called genuine medicinal materials, also known as genuine medicinal materials, is a special term for high-quality and pure medicinal materials. It refers to medicinal materials with long history, suitable origin, excellent varieties, high yield, well-processed, outstanding curative effect and regional characteristics. For example, Angelica sinensis in Gansu, Lycium barbarum in Ningxia, Rhubarb in Qinghai, Astragalus membranaceus in Inner Mongolia, Ginseng, Asarum, Schisandra chinensis in Northeast China, Codonopsis pilosula in Shanxi, Radix Rehmanniae, Achyranthes bidentatae, Yam and Chrysanthemum in Henan