In this paper we discuss the dynamic property of light scattering of unneutralized electrolyte solutions and the photon correlation spectra.The resultsshow that weak un-neutralization can largely increase the measured diffusion coefficient and, comparing with neutral electrolyte solution, the diffusion coefficient of unneutralized one is more sinsitive to the scattering angle. For a dilute electrolyte solution of 10-3 molar with unnentralization of 1%, an enhancement of 102-103 in the diffusion coefficient can be obtained. The physical mechanism of unneutralization effect is discussed.