[en] The authors provided a personal computer program to simulate and analysis Rutherford Backscattering spectra. The algorithms of the simulation program assume a uniform sample and use a mathematical model that the sample is considered to be made up of many sub-layers. Detector resolution can be simulated by convolving the ideal spectrum with a Gaussian. The effects of straggling are difficult to compute efficiently. The Simulation program which has been proved to be precise is refitted to be a generator of RBS (GENRBS), and creates a set of standard data to fit the experimental data. The fitting parameters are the unknown quantitative results. A damping item and a parabola interpolation algorithm are added to the fitting program to increase the reliability and accuracy. The two programs have applied to backscattering experiments and the results have conformed to the experimental values