In the optical communication, the choosing scanning style is important for the optical communication, because the illuminating laser beam is narrow and the communication range is long. In this study, three typical scanning styles of raster scan, spiral scan and square spiral scan are compared with each other. The characteristics of the scanning styles are introduced. The numerical simulation model is built. The capturing time at the same condition is computed. The capturing time is affected by the scanning interval and the scanning area. In the same scanning area and scanning interval, the capturing time of raster scan is the biggest one and the capturing time of the square spiral scan is the smallest one.