Yan Hu Suo, invigorates blood, induces Qi and relieves pain. Used for chest and hypochondrium, epigastric pain, dysmenorrhea, postpartum stasis, swelling and pain. Compendium: “Yanhusuo, can line the blood in the gas stagnation, gas in the blood stagnation, so specializing in the treatment of a body up and down all the pain, with the use of the middle, wonderful. The Materia Medica seek the truth “:” Yan Hu Suo, whether it is blood or gas, accumulation and not scattered, serving this force can be access to the nature of its warmth, then in the gas and blood can be able to walk can be smooth, flavor is in the gas and blood can be run can be dispersed, so all up and down a body of pain, often solo line of work more “. Yanhuisuo for the central nervous system has obvious analgesic, sedative and hypnotic effect, and to Yanhuisuo ethylin analgesic effect is the strongest, its analgesic effect through the blockade of the spinal cord above the D2 receptor to achieve. It can be used as a substitute for morphine-like drugs. Skin stratum corneum resembles a lipid-like membrane, and components with large lipid solubility can easily pass through the stratum corneum, and fenugreek is a benzylisoquinoline alkaloid with strong lipophilicity. Studies have shown that the same amount of total alkaloids and different amounts of Angelica dahurica volatile oil, absorbed by the small intestine, the content of the ethylene glycosides are higher than the pure total alkaloids extract, and with the formula of Angelica dahurica volatile oil added to the amount of the first increase and then show a decreasing trend, and Angelica and Angelica dahurica can be enhanced in the precipitation of the ethylene glycosides of Yanhuosuo. The mechanism of action of lanolin on the skin was studied, and it was concluded that anhydrous lanolin can absorb water and form o/w emulsion, and they can release water into the environment. Lanolin delivers water in two ways: one is through the penetration of water absorbed by lanolin into the stratum corneum, and the other is that it is also compatible with the intercellular lipids of the stratum corneum. In the formula, Tiannanxing is used to reduce swelling and relieve pain as the monarch, Angelica dahurica and Yanhuisuo enhance the function of the monarch in reducing swelling and relieving pain, and lanolin matrix is used as the enabler to promote the absorption of the drug directly to the lesion. The combination of all the drugs together play the role of swelling and pain relief, the treatment of soft tissue injuries.