Method for maintaining constant degree of saturation of test soil body

The invention provides a method for maintaining constant degree of saturation of a test soil body and aims to solve the problems that in prior art, the maintenance of the degree of saturation of the test soil body is random and the accurate degree of the test is low. The method includes placing the test soil body in enclosed space; testing the initial temperature and humidity of the air above the soil body, and calculating to obtain an initial air moisture content V1; testing to obtain the relative humidity of current air when the temperature rises to a certain degree, inquiring the dew point temperature which corresponds to the air humidity, and calculating to obtain a current air moisture content V2; calculating a differential value delta V of the current moisture content V2 and an initial moisture content V3 to serve as evaporation amount of moisture in the soil body; and supplementing delta V of moisture into the soil body so as to maintain the constant degree of saturation of the soil body. By means of the method, moisture is accurately supplemented to the soil body, the constant degree of saturation of the soil body can be simply and effectively maintained, and thereby the test result of the experiment is objective, real and reliable.