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With the development of network high precision fixed node time and frequency synchronization technology, the node-end multi-input signal needs to be processed. Aiming at the characteristic of the node-end multi-input signal that they are homologous and come from the different path, in order to improve the damage resistance of the system, a method of signal nondestructive switching is proposed, and the corresponding simulation experiments are carried out; A design scheme of system switching switch is presented, which takes into account the isolation degree and switching speed of the switch; We implement the main and standby signal synchronization accuracy of picoseconds level, effectively restrain the switching process of phase jump, and the different conditions of the main rode for the accuracy of signal phase synchronization, system condition the performance of the switch are simulated. The simulation results show that the proposed scheme significantly increased the main road phase synchronization precision, effectively restrain the switching process of phase jump, the influence of different conditions on the system accuracy is verified, the node-end condition switch and signal integration with great significance.