As we all know， about 70% of the earth is covered by water. The chapter 25 of Moral Classics described that “Man complies with Earth， Earth complies with Cosmos， Cosmos complies with Tao and Tao complies with Nature”， therefore， Cosmos-Earth is a big universe while the mankind is a little universe. Body fluid accounts for about 70% of body weight in adults， and the declining proportion of body fluid would cause the end of life; therefore， men cannot survive without the body fluid. The occurrence and development of the disease of consumptive thirst is closely related to the condition of body fluid， so to adjust body fluid would treat consumptive thirst. This paper brings up three methods of adjusting body fluid， namely， clearing source of body fluid， grooming channel of body fluid and nourishing the important organs of body fluid.