In 5G era, it is expected to achieve wireless network coverage including off-shore areas. Modeling of marine wireless channels is the basis of constructing a ma-rine communication system. In this paper, a communication scene between an unmanned aerial vehicle (UAV) and a boat is simulated to study the marine wireless channel. Firstly, an improved spatial partitioning ray tracing algorithm is proposed to track the propagation path of electromagnetic waves at sea surface. Secondly, a mobile channel is simulated and modeled based on the track results. Finally, a loss measurement is carried out in the coastal waters based on the simple wireless channel loss measuring platform, and a path loss prop-agation model is built. Then we compare the actual measurement data with the simulation results and find that the two are have good consistency, which further verifies the reliabil-ity of the simulation.