The nonlinear behavior of stimulated Raman scattering (SRS) in a low-loss optical fiber has been analytically and experimentally investigated by the assumption of certain restraint conditions. As a result, it has been found that the SRS light propagating along the optical fiber is expressed in a simple formula by the introduction of nonlinear parameters, which are experimentally identified and whose maximum value is restricted by the restraint conditions. The parameters, moreover, are available for compensating the SRS intensity in the presence of noninteracting light. Therefore the formula for SRS intensity presented is useful for investigating the SRS effect in a multimode fiber.