Abstract: In this paper, the technological process system of Wujiagou to Nanyangpo water conveyance project of Nanyangpo coal industry Co. LTD.was briefly introduced.On this basis, the design selection, structure and reliability design of the automatic control system were demonstrated in detail.Six major functions,which were global preview, pressure automatic adjustment, water level automatic interlock protection, automatic mud removing, water hammer protection and pipeline leak detection of the control system were discussed in detail combined with the long-distance water conveyance process characteristics.In the discussion of pressure automatic adjustment, the concept of low-value selector functional module was introduced, which could selectively output low-value signals from all the input signals in order to realize the automatic adjustment of drainage pump inlet and outlet pressure.