Decoctions need to choose the fire and cooking time according to the drugs. The antidote has volatile oil components with more fragrant odor, and prolonged decoction will easily lead to the loss of active ingredients and reduce the efficacy, so it can be decocted on high or medium heat and then turn to low heat for about 15 minutes. The second and third decoction for about 10 minutes. The tonic drugs, due to the texture of the more nourishing, long decoction can analyze the active ingredients, should be first decocted with high or medium heat, followed by small fire decoction. The first decoction can be about 30 minutes, the second and third decoction about 30-60 hours, the decoction process is longer, need to be stirred, in order to prevent the drug from burning. Burnt medicines are best discarded.