As shown in Fig. 5, the design of MSHIM control strategy includes power level control and power distribution control. The reactivity balance analysis method is used to the design of power level control which consider the influence of the power defect and the xenon transient. In CPR1000, by inserting the part G1-bank, the power level can be controlled. In power distribution design, consider the impact of burnup, RCCAs and xenon transient, and use AO control analysis method to ensure the safety