Abstract: Network-on-Chip（NoC） is one of the major methods which are used to solve the communication between each IP core in System-on-Chip（SoC）.However，the mapping of NoC is one of the most critical steps in the NoC design process.This paper uses an improved method to settle NoC mapping problem.This method is based on the quantum evolutionary algorithm and uses an improved renew way，then introduces the best tactics to make the whole solutions in the process participate in the repeatedness.It chooses the best solution of the process to the final answer of every repeated NoC mapping.It uses the method to set up a power-consumption maths model which is built in the situation of postphone restraint.The experiment shows that in this way，it can get the purpose of decreasing the communication power-cunsumption.