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Cu(OH)2 nano-fibers were prepared by chemical precipitation with CuSO4·5H2O and NaOH as raw materials.The Cu(OH)2 nano-fibers have a diameter of 10-30 nm and a length of 1-6 μm. The reaction conditions were as follows: the concentration of CuSO4 solution was 0.1 mol·L-1, NaOH solution 4 mol·L-1, the dropping rate of the NaOH solution 50 mL·min-1, the reaction temperature 20℃, the pH value of the reaction terminal 13, and the stirring rate 1200 r·min-1. The chain nano-CuO grains were obtained through the microwave radiation of the Cu(OH)2 nano-fibers.