Abstract: There is little experiences in the control rod operation of domestic nuclear power plants, and no control rod regulation or standard is available for the change of the control rods. In order to understand the control rod cladding, Qinshan II NPP checked the control rod cladding in service by nondestructive testing methods such as the ultrasonic and eddy current.,The reliable technical data for the operation of the control rods is obtained, to provide a basic for the adjustment and change of the control rod assemblies. In this paper, through the analysis and evaluation of the typical defect mechanism for the control rod assemblies, several measures to optimize the management of the control rods are proposed, to provide as a reference for the management of the control rods of other nuclear power plants.