Firstly it summarizes how laser speckle is formed, then speckle supp ression is simp lified in the near field by reducing or eliminating temporal or spatial coherence of the laser, and disadvantages are detailed to reduce speckles only by changing the coherence properties of laser in the far field such as in laser TV.Rotating polygonmirrorwith two-dimensional scanningwhich can decrease speckles in the far field is proposed and how rotating polygon mirror is illuminated in detail. When combined laser beams go through rotating polygon mirror with two-dimensional scanning, moving interference fringes produce \" boiling\" speckle patterns in the screen. Finally speckle contrast is explained when combined laser beams pass rotating polygon by taking example for red beam, which effectively reduce speckles in laser display owning to rotating polygon mirrorwith two - dimensional sanning.