There are some differences in optical intensity signals under differ ent transmission environment conditions,which is affected by atmospheric turbulence.In order to s tudy the transmission characteristics of optical intensity signals and the differences between the m,this paper presents some experiment results of 4measurements of laser transmission over the road an d the sea surface environment by using the large aperture scintillometer,and the optical path di stances are 1.4km and 0.9km,respectively.Based on the measured data,firstly,the change trends of atmo spheric refractive index structure constant and Rytov variance are analyzed and the diff erences of the degree of turbulence and optical intensity fluctuation are studied over the road and th e sea surface environment.Secondly,the transmission characteristics are studied by analyzing t he optical intensity signals of aperture averaging over these two kinds of environment.It is anticipated that this kind of signal data analysis is good for the study on atmospheric optics and free space optical communication system development.