对水二甲基亚砜二元混合溶液质量分数和温度与折射率的关系进行了理论和实验研究，对几种经典模型的拟合结果进行了比较，给出了适合水二甲基亚砜混合溶液的经验公式。对水性金溶胶二甲基亚砜混合溶液质量分数和温度对局域表面等离子体共振峰值波长的影响进行了理论和实验研究，结果表明：水性金溶胶二甲基亚砜混合溶液质量分数对共振峰值波长的调节有较好的线性关系和较大的调节范围，当温度从20 ℃增大到60 ℃，混合溶液金溶胶的共振峰值波长增加了1367 pm，温度敏感度为34 pm/K，在0%~100%的质量分数范围内，混合溶液金溶胶的共振峰值波长平均产生8.5×103 pm的增长。

The relations of the mass fraction and temperature of mixtures of water and dimethyl sulphoxide (DMSO) to refractive index are theoretically and experimentally studied. The empirical formula fit for calculating the refractive index of the mixture is chosen by comparing the simulation results of several classical models. Then the effects of mass fraction and temperature of the mixture of aqueous gold colloids and DMSO on localized surface plasmon resonance are studied. The theoretical and experimental results show that the mass fraction of the mixture of aqueous gold colloids and DSMO has linear relationship with the resonance wavelength of localized surface plasmon in a large range. The resonance wavelength of the mixed gold colloids increases by 1367 pm when the temperature increases from 20 ℃ to 60 ℃, and its temperature sensitivity is 34 pm/K. The increase of resonance wavelength with mass fraction is 8.5×103 pm in a 0100% mass fraction range.