Laser communication is essential part of maritime-terrestrial-air intelligent communication/sensor network.Among them,different modulation formats would play a unique role in specific applications.Based on Rytov theory,we dis-cussed system performance of the maritime laser communication with repeated coding technology in several modulation schemes.The closed-form expression of average bit error rate(BER)from weak to moderate atmospheric turbulence described by log-normal distribution is given.Differential phase shift keying(DPSK)modulation,as a potential solution for future maritime laser communication,has attracted a lot of attention.We analyzed the effects of atmospheric turbu-lence parameters(visibility,refractive index structure coefficient,non-Kolmogorov spectral power-law exponent,tur-bulence inner scale)and DPSK system parameters(receiver aperture diameter,repeat time)on average BER in detail.Compared with the aperture-averaging effects,the system BER can be well suppressed through increasing repeat time.This work is anticipated to provide a theoretical reference for maritime laser communication systems.