Boiling Chinese medicine with how much water is generally based on the number of herbs and the nature of the herbs to decide, the general decoction of water to the surface of the herbs did not exceed 3-5cm is appropriate. 1. The amount of herbs: the amount of water added to the boiling of the medicine, for whether or not the active ingredients of the drug can be well decocted has an important role. If the herbs are more, the need to add more water, generally the first decoction of water needs to be no more than the surface of the herbs 3-5cm, the second water needs to be no more than the herbs 2-3cm, so that the simmering out of the medicine is generally the amount of water is just right; 2. The nature of the herbs: but for different nature of the drug, add water should also pay attention. For example, flowers, grasses and leaves, such as light and clear of the quality of fluffy, easy to absorb water, you need to add a little more water; but for the harder texture, such as ore drugs, poor water absorption, the need to add a little less water. There is no clear rule on how much water to add to the medicine, you need to control yourself according to the situation. Generally, the amount of medicine to be decocted at one time is 150~250 ml, and finally the two decocted medicines will be mixed and divided into two times, which is more effective.