Abstract: This paper introduced a computer controlling system of lysimeter used to measure evaporation, transpiration and seepage. It is developed for the Ansai Comprehensive experimental station of soil and water conservation in Loess Plateau of Chinese Academy of Sciences. It offers advanced technique methods and favorable test conditions for accelerating development in dynamics of hydrology research and field experiment of soil evaporation and precipitation infiltration. Above all,the computer measuring and control system, a part of the whole system was discussed more detail in the functions, design of the structure, hardware, software and so on.