Aiming at the scattering effects of seawater optical channel, the Henyey-Greenstein function is selected to generate the scattering angle. Based on the Monte Carlo(MC) simulation method, the effects of transmission distance and field of view (FOV) on the proportion of scattering components of arriving optical signal under caseⅠseawater and caseⅡseawater channels are analyzed successively. The results show that the proportion of scattering components of arrival optical signal under caseⅠseawater is less than 1.2%. The scattering components is significantly increased under caseⅡseawater channels, and the value of FOV has an obvious effect on the proportion characteristics of scattering components. Especially for the caseⅡseawater (harbor) channels, the proportion of scattering components is approaching to 100% when the transmission distance is longer than 6.0 m.