The emerging of very low earth orbit mega-constellations for satellite networking opens up a new area for next generation of the wireless communications, by deploying the low orbit satellites, the ground-satellite link latency is drastically reduced, by densify the mega-constellations, the network capacity is increased, the optimization of network architecture can deliver the services using the satellite networks as an alternative to the terrestrial cellular networks. In addition, to realize the full earth coverage, such a very-low-earth-orbit-mega-constellation (VLEOMC) for satellite network can enable a host of new service capabilities. In this talk, we present the design and evaluation of the satellite to terrestrial and inter-satellite communications, and we also compare the performance with cellular networks and troposphere networking.