Generally, it is better to add 5-6 times of the weight of medicinal materials, which will absorb 3 times of its own weight, leaving about 1-2 times, and adding 3 times of water for the second time, leaving about 2 times. For aromatic drugs, the first decocting time should not exceed 10 minute, so it is best to add less water and soak for 1 hour before decocting.