用微乳液法制备了不同粒径的表面改性的纳米银粒子，并用 ＥＳＲ、 ＴＥＭ和紫外／可见吸收光谱研究了改性纳米银粒子／有机溶剂体系的界面作用、分散性和光学性能．结果表明：改性的纳米银粒子有一系列表面顺磁局域态．其 ＥＳＲ谱参数与粒径的关系不符合 Ｋａｗａｂａｔａ理论预测；氯仿与粒子有强烈的相互作用，粒子越小作用越强，且越易分散；氯仿作为粒子的良分散剂和高分子的良溶剂，可用于溶液共混工艺制备纳米银／高聚物复合材料． Surface-modified silver nanoparticles with different particle sizes were prepared by microemulsion method. The interfacial effects, dispersion and optical properties of the modified silver nanoparticles / organic solvent systems were investigated by ESR, TEM and UV / Vis absorption spectra. The results show that the modified silver nanoparticles have a series of surface paramagnetic localized states. The relationship between ESR parameters and particle size is not in accordance with Kawabata theory. Chloroform has a strong interaction with particles, and the smaller the particles, the stronger the effect and the easier to disperse. Chloroform, as a good dispersant for particles and good solvent for polymers, It can be used in solution blending process to prepare nano silver / polymer composites.