Abstract: The temperature of the stator rod outlet and the rod layer were abnormal, in No.1 generator in a power plant. As closing down the unit, make inspection to find out the inappropriate water quality caused the winding rod clogging. Carry out the backwashing and acid washing to recover the high temperature of the winding rod. Put forward to improve the water quality of the constant cooling water system of the generator, strengthen the maintenance and inspection of the generator to greatly reduce the high temperature of the wire rod caused by the scaling blockage.