Abstract: Rational coal washing processes are designed for the Nalinhe No. 2 Coal Preparation Plant according to the raw coal property, product structure and use, and the requirements of targeted users. An introduction is made to the equipment selected for use, arrangement of processes as well as the design features. Practice shows that the plant can work smoothly thanks to its use of reliable and flexibly arranged washing processes and advanced equipment. The medium consumption for washing coarse coal is controlled at 0.6 kg/t while that for small coal is 1.05 kg/t. The sulfur content of clean coal is reduced to below 1.5% and the ash of refuse goes over 75%, all well meeting the design requirements. The design practice may serve as a reference for the adjacent power coal washing plants in design of washing processes.