The analytic solution for spatially-resolved diffuse reflectance based on the Delta-P1 approximation for the two-point-source approximation is investigated. We have derived the radiative transport equation and the expression of the effective source by using scattering phase function which contains Dirac delta function. The analytic solution RDelta-P1,2(ρ) considering two-point-source approximation to the Delta-P1 model is presented. By comparing RDelta-P1,2(ρ) with the diffusion approximation RSDA(ρ),it is demonstrated that the Delta-P1 approximation RDelta-P1,2(ρ) models the radiance in moderate albedo media or close to source (ρ about 1.5 mm) more accurately than diffusion theory with the relative errors within 15%. Furthermore,the analytic solution RDelta-P1,2(ρ) provides the prediction of the second-order parameter γ of phase function,which is important for developing the inversion algorithm to recover optical parameters from the spatially-resolved diffuse reflectance measurements with small source-detector separations.