In network simulation, switching mechanism technology provides strong support for resource allocation and transmission efficiency in satellite internet. However, the switching mechanism of existing network simulation technology cannot simultaneously meet the requirements for communication quality and communication time in scenarios of frequent switching. In view of the limitations of excessive switching times and insufficient access duration posed by the general switching strategy, this study ingeniously combines the advantage of the single-satellite holding strategy in terms of access duration with the general elevation angle limit strategy. Subsequently, a brand-new multi-criteria satellite and terrestrial link switching mechanism is proposed, thereby achieving a dual guarantee of communication quality and communication time. Based on the proposed multi-criteria satellite and terrestrial link switching mechanism, a new link performance simulation technology has been developed. This technology can not only simulate the real-time parameters of the link but also simulate the switching state of the satellite and terrestrial link. Experiments show that compared with the elevation angle limit strategy, the proposed multi-criteria switching strategy reduces the number of satellite and ground link switches by 46.5% and increases the single communication duration by 92.9%. At the same time, it can realize real-time dynamic performance simulation and switching simulation of the link, optimize the problem of insufficient dynamics of link simulation, and further improve the fidelity of the simulation.