1、自然干燥是指把切制好的饮片置日光下晒干或置阴凉通风处阴干。《神农本草经》序录中就有“……阴干暴干，采造时月，生熟，土地所出，真伪新陈，并有各法”。晒干法和阴干法都不需要特殊设备，如水泥地面、药匾、席子、竹晒垫等均可应用。具有经济方便、成本低的优点。但本法占地面积较大，易受气候的影响，饮片亦不太卫生。一般饮片均用晒干法。对于气味芳香，含挥发性成分较多、色泽鲜艳和受日光照射易变色、走油等类药物，不宜曝晒，通常采用阴干法。一般药物的饮片干燥传统要求保持形、色、气、味俱全，充分发挥其疗效。现将不同性质的药物及干燥方法，归纳为八个类型分述如下：1、粘性类 粘性类药物如天冬、玉竹等含有粘性糖质类药材，潮片容易发粘，如用小火烘、焙，原汁不断外渗，会降低质量，故宜用明火烘焙，促使外皮迅速硬结，使内部原汁不向外渗。烘焙时颜色随着时间演变，过久过干会使颜色变枯黄，原汁走失，影响质量，故一般烘焙至九成即可。掌握干燥的程度，只需以手摸之感觉烫不粘手为度。上烘焙笼前摊晒纺霉，旺火操作要注意勤翻，防止焦枯，如有烈日可晒至九成干即可。2、芳香类 芳香类药物如荆芥、薄荷、香薷、木香等，保持香味极为重要，因为香味与质量有密切的关系，香味浓就是质量好。为了不使香味走散，切后宜薄摊于阴凉通风干燥处。如太阳光不太强烈也可晒干，但不宜烈日曝晒。否则温度过高会挥发香气，颜色也随之变黑。如遇阴雨连绵天气，药材快要发霉，也只能用微火烘焙，决不能用猛火高温干燥，导致香散色变，降低药物的效能 。

1, natural drying refers to cut good pieces placed in the sun under dry or cool dry well ventilated place. "Shen Nong's Materia Medica" is recorded in the preface"...... When storm dry mining created, raw and cooked, the land, the authenticity of the new Chen, and the law". The sun dried and dry method does not need special equipment, such as cement, ground mat, bamboo plaque, medicine drying pad can be used. The utility model has the advantages of economy convenience and low cost. But this method covers a large area, which is easy to be affected by climate, and the pieces are not very sanitary. General pieces are dried by the sun. The fragrant, containing more volatile components of bright color and sun discoloration, take the oil and other drugs, not exposure, usually by dry method. The traditional drying method of traditional medicine requires keeping shape, color, gas and taste, and giving full play to its curative effect. The different nature of the drug and drying method, divided into eight types as follows: 1, viscous viscous drugs such as asparagus, sweet herbs contain Polygonatum viscous, sticky film to tide, such as low heat drying, baking, juice will reduce the quality of continuous medium, it should use the fire baking promote the skin quickly, induration, make the internal juice to extravasation. When baking, color changes with time, too long dry will make the color yellow, the juice lost, affecting quality, so generally baked to 90%. Grasp the degree of drying, just to touch the feeling of hot non stick hand for degrees. On the front of the cage spinning by baking tedding, stir operation should pay attention to prevent scorch, such as ground turn, the sun can be dried in the sun to dry 90%. 2, aromatic aromatic drugs such as Nepeta, mint, Elsholtzia, woody, keep the fragrance is very important, because there is a close relationship between aroma and quality, flavor is good quality. In order not to smell separated, after cutting should be spread thin in a cool and dry place. If the sun is not too strong, you can also dry, but not hot sun exposure. Otherwise, the temperature is too high will evaporate aroma, the color will also become black. If the weather is rainy, herbs can only use microflame moldy, baking, never use Menghuo high temperature drying, resulting in incense powder discoloration, reducing drug efficacy.

3、粉质类 粉质类就是含有淀粉质较多的药物，如山药、浙贝母等。这些药材潮片极易发滑、发粘、发霉、发馊、发臭而变质，必须随切随晒，薄摊晒干。由于其质甚脆，容易破碎，潮片更甚，故在日晒操作中要轻翻防碎。如天气不好，要用微火烘焙，保持切片不受损失。但火力不宜过大，以免烘至药物外色焦黄。

3, silty, silty, is containing more starchy drugs, such as yam, Zhejiang Fritillaria and so on. These medicines can easily slip, tide sheet sticking, moldy, sour, smelly and bad, must be with the cut with the sun dried, spread thin. Because its quality is very fragile, easy to break, and even more damp, so in the sun to light up the operation to prevent fragmentation. If the weather is not good, want to use Weihuo baking, keep slices without loss. But the fire is too large, so as to avoid drying to drug color brown.

4、油质类 油质类药材如当归、怀牛膝、川芎等，这类药物极易起油，如烘焙，油质就会溢出表面，色也随之变黄，火力过旺，更会失油后干枯影响质量，故意日晒。如遇阴雨不能日晒，也只能用微火烘焙，以防焦黑。

4 kinds of herbs such as oily, oily angelica, Achyranthes root, chuanxiong, this kind of drug is easy to oil, such as baking, oil will overflow surface, color becomes yellow, fire excess, it will affect quality of dry oil loss after intentional sun. In case of rain can not the sun, can only use Weihuo baking, to prevent black.

5、色泽类 色泽类药材如桔梗、浙贝母、泽泻、黄芪等。这类药材色泽很重要，含水量不宜过多，否则不易干燥。其白色类的桔梗，浙贝母宜用日晒，越晒越白。黄色类的泽泻、黄芪，如日晒则会毁色，故宜用小火烘焙，且可保持黄色，增加香味，但不能用旺火，以防焦黄。

5, color, color, medicinal herbs, such as Platycodon grandiflorum, Zhejiang fritillary, Alisma orientalis, Astragalus and so on. This kind of medicinal material color is very important, water content should not be too much, otherwise it is not easy to dry. The white class of Platycodon grandiflorum, Thunberg Fritillary is suitable for the sun, the sun is more white. Yellow class Alisma, astragalus, such as the sun will destroy the color, it should be baked with a small fire, and can keep the yellow, add flavor, but not stir, to prevent brown.