By using numerical simulation, we analyzed the effect of the transmitting system's tracking jitter on the beam spreading induced by atmospheric turbulence. The scaling relations that describe the effect of tracking jitter on the beam spreading are obtained. When the angle radius of the diffraction spot's the first dark ring is big, the effect is relatively small. But when the angle radius is small, especially for turbulent effects being weak, the effect on the beam spreading is very distinct, and the magnitude of the beam spreading is mainly dependent on the jitter item of the scaling relations. In general, when turbulent effects are weak, the effect of tracking jitter is relatively distinct. However, with turbulent effects being gradually strong, gradually the magnitude of the beam spreading is mainly dependent on the turbulence item of the scaling relations. Therefore, through these scaling relations, we can quantitatively learn the effect of diffraction of transmitting system, tracking jitter and turbulent effects on beam spreading under different conditions. Moreover, we can obtain the scientific basis for the practical engineering systems' optimization design.