用溶液聚合法制备出轻度交联的含铅微凝胶，用光子相关光谱技术测定其在良溶剂中与Ｈ_２Ｓ反应前、后的扩散行为，由外推法得到在浓度无限稀时的分子扩散系数，给出微凝胶的流体力学半径。结果表明：相同量的含铅微凝胶在不同的初始浓度下与Ｈ_２Ｓ反应，生成含ＰｂＳ纳米微粒的凝胶；但其体积增大不同，这说明Ｈ_２Ｓ与含铅微凝胶的反应既可以在分子内也可以在分子间进行，分子间的反应使含硫化铅微凝胶扩散系数随浓度的变化曲线的线性范围变小． The lightly crosslinked lead microgels were prepared by solution polymerization. The diffusion behavior of the lead microgels before and after reaction with H 2 S in good solvents was determined by photon correlation spectroscopy. The extrapolated molecules were obtained by extrapolation at infinite concentration The diffusion coefficient gives the hydrodynamic radius of the microgel. The results show that the same amount of leaded microgels react with H 2 S at different initial concentrations to produce gels containing PbS nanoparticles; however, their volume increases are different, indicating that H 2 S can react with leaded microgels In the molecule can also be carried out in the intermolecular, intermolecular reaction lead sulfide microgel diffusion coefficient with the concentration of the curve of the linear range becomes smaller.