On the basis of extended Huygens-Fresnel principle and quadratic approximation, general expressions of the beam spread reflected from a target in a turbulent atmosphere are devivod. Tho properties of reflected beam spread are investigated. It is found that there exist "amplification" and "self-compensation" of beam spread in the reflection from a mirror and a corner cube reflector, respectively. Calcutations show that the spread can be reduced by using a long-wavelength laser as well as large transmitting and reflection radii.