The solution properties for Poly(styrene-divinylbenzene) (PSt-DVB) in toluene and cyclo-hexane have been studied by photon correlation spectroscopy. The time correlation function of concentration fluctuation for PSt-DVB having wave vector q is proved to have the form of an exponential decay. The average decay rate is given by г= q2D. The variant rate of decay rate is zero within thhe accuracy errors. The first time correlation function of scattering field was analyzed by the method of cumulant. We obtained the diffusion coefficient of PSt-DVB particle as a function of theconcentration and tempera ure. The hydrodynamic radii for the particle in the good solvent

and the theta solvent

were calculated by means of Stokes-Einstein equa-tion. The molecular morphology for PSt-DVB particle in solution was also studied.