You can add water halfway through the boiling of herbs, by adding water you can prevent the herbs (water liquid) from being too little and causing the herbs to appear boiled by the high temperature. In addition, by adding water can well regulate the temperature in the herbs, which has a certain effect on the simmering of the medicine. In principle, it is best not to add water in the middle of the boiling process, but if the conditions are limited or due to circumstances, you can add water in the middle of the boiling process. Simmering Chinese medicine is a very deep learning, simmering time is best in an hour or so, and herbs in the simmering before the best soaking, so that can be very good to make the medicine into the soup, oral effect is more ideal. Clinical for the simmering of the fire, the beginning of the fire is a little bigger fire, to the late change into the fire, so that repeated decoction for the Chinese medicine to boil through, has a certain effect.