Abstract: Coastal ship communication faces the difficulty of medium absorption of high-frequency electromagnetic waves( HF) ，scattering of electromagnetic waves by sea surface turbulence，and multipath signal interference caused by reflection of electromagnetic waves by sea objects． According to the characteristics of the shore-ship communication communication channel，the channel transmission model is established，and the unit impulse response of the channel is solved． The method of the receiver based on double-angler anti-multipath interference in the ship-to-ship communication is proposed． By utilizing the energy of the multipath signal，the communication quality can be improved without increasing the transmitter power，and the anti-multipath effect is good and easy to implement． The high-frequency electromagnetic wave ionospheric reflection model is established． The solution triangle communication algorithm is used to study the time that shore-to-ship communication can maintain communication，which is convenient for improving communication protocol and improving communication quality． The simulation results show that the longest day can maintain 4． 5 h of communication，and the longest can maintain 7． 5 h of communication at night．

Key words: shore-ship communication, channel transmission model, dual recalibrator to resist multipath interference, delta-triangulation algorithm, how long can maintain communication