The characterization of photoinduced refractive index change (Δn) and the relation between Δn and the intensity of pumping beam in the azobenzene doped polymer are investigated using surface-reflection configuration in which a circularly polarized pumping beam at 514 nm and a probing beam (s-ray) at 632.8 nm are used. For a given pumping intensity (0.570 W/cm2), the surface reflectivity of the sample is measured at a series of incident angles of the probing beam, and the Δn is about -0.0035. Furthermore, the investigation shows that Δn increases with increasing the intensity of pumping beam, and Δn reaches a value of 10-2 when the intensity of pumping beam is 0.800 W/cm2.