提出了一种确定激光粒度仪中颗粒尺寸分布的新算法，该算法采用函数限制解法，能对具有单峰及双峰分布形式的颗粒尺寸进行精确求解。同时给出了计算机数值模拟结果及实测结果。 A new algorithm for determining particle size distribution in a laser particle sizer is proposed. The algorithm uses a function-limited solution to solve the particle size with unimodal and bimodal distributions. At the same time, computer numerical simulation results and measured results are given.