To learn how to decoct, master the following three steps: First step, soak the drug in cold water for 30-60 minutes, the amount of water soaked to submerge the surface of the drug 3cm-5cm is appropriate. The second step is to put the medicine on the fire, boil it with martial fire, and then change to civil fire to keep it boiling and slightly boiling to slow down the evaporation of water, which is beneficial to the dissolution of active ingredients, and start timing after changing to civil fire, decocting the medicine for relieving the symptoms of cold and flu for about 15-20 minutes, and decocting other medicines for 40-50 minutes. Step 3: Pour out the first decoction, add the right amount of hot water, not too much water, to just submerge the herbs 2cm-3cm is appropriate, for the second decoction, the decoction time is about 20-30 minutes can be.