The analytic expression for the wandering angular variance of the speckle formed by multiple beams focused on the target in the horizontal homogeneous atmosphere is given when the atmospheric turbulence is described with Kolmogorov spectrum. 给出了用Kolmogorov谱描述大气湍流时,在水平均匀大气中多束照明光在目标上形成光斑的漂移角方差的解析表达式。