提出一种针对光强接收面为离焦曲面的连续相位板(CPP)的设计方法，该方法改进了传统的Gerchberg-Saxton (GS)迭代算法，不再以焦面作为设计目标，在每一次的迭代过程中都考虑实际离焦的影响，以离焦面作为设计目标；同时为了解决曲面设计问题，提出修正重构离焦面上的目标光强函数的方法。模拟计算表明，新的连续相位板设计方法，相对于以焦面作为设计目标的传统方法，可以很好地控制离焦曲面上的焦斑轮廓，得到很高的能量集中度，可满足惯性约速聚变对束匀滑元件相位连续性、光斑包络及能量集中度的要求，较好地解决了离焦曲面上的束匀滑问题。

A new method of designing continuous phase plates (CPP) for beam smoothing has been studied. The new CPP is applied when the diffraction field is a out-of-focus and curved surface. The traditional Gerchberg-Saxton (GS) algorithm is improved. During algorithm′s each iteration, the out-of-focus plane is regarded as design goal instead of focal plane. And the objective function for compensating the impact of cuned surface is reansomcted. The simulation has proved that the new CPP can control the envelope of focal spot on the out-of-focus curved surface well and obtain high energy concentration, so the demand of the distribution continuity for beam smoothing element, good profile of the target beam and high energy concentration in inertial confinement fusion can be satisfied simultaneously by this algorithm.