In recent years, underwater optical communication has become a hot field of research in various countries. The construction of underwater optical communication channel model is particularly important, in this paper, we use Monte Carlo method to simulate the transmission of underwater light signal. Comparing 3 scattering phase functions, HG phase function, TTHG phase function, FF phase function, and after comparison analysis, it is found that the FF phase model can be better approximated to the measured data than the HG phase model and TTHG phase model.