研究了部分相干径向偏振光束经透镜聚焦后，在聚焦区域内，对于瑞利粒子(半径小于波长)产生的辐射力的分布情况。基于Collins公式，推导了部分相干径向偏振光通过透镜聚焦后，在几何焦平面附近的光强表达式，并应用瑞利散射理论，计算了聚焦光束与瑞利粒子的相互作用力。根据数值模拟的结果，比较了部分相干径向偏振光束与部分相干线偏振光束经透镜聚焦后辐射力的分布情况。并且经过研究发现，通过改变部分相干径向偏振光的相干度，在几何焦平面内的辐射力有着明显的变化，且利用部分相干径向偏振光束经透镜聚焦后焦平面内辐射力的变化特性，能同时对高折射率粒子和低折射率粒子进行捕获。

The radiation force of focused partially coherent radially polarized doughnut beam acting on a particle (r<λ) in the Rayleigh scattering regime is theoretically studied. Based on the Collins formula, expressions of intensity distribution in the focal region are derived, and the interaction forces between light and the Rayleigh particle are calculated using the Rayleigh scattering theory. Numerical calculations are shown to compare the different radiation forces of a partially coherent radially polarized doughnut beam and a partially coherent linear polarized beam. It is found that the radiation forces in the focal field are obviously different with the different correlation widths, and the particles whose refractive index is lower or higher than the ambient can simultaneously be trapped by use of focused partially coherent radially polarized doughnut beams.