The absorption and transport scattering coefficients of biological tissues determine the radial dependence of the diffuse reflectance that is due to a point source. In order to noninvasively determinate the optical scattering and absorption coefficients of biological tissue, we must know the radial dependence of the diffuse reflectance. There are several different solutions of the diffusion equation for steady-state spatially resolved reflectance for different approximation and boundary conditions at the turbid-medium-air interface. To determine which solution is more accuracy, we compared these solutions with Monte Carlo simulations and fitted the solution data with Monte Carlo simulation results. The accuracy of the different solutions are given, which are useful for noninvasive determination of the optical scattering and absorption coefficients of biological tissue.