Abstract: Based on a low-weight stretched-membrane solar concentrator system,the flux radiation distributions of the stretchedmembrane solar concentrator at the received plane were calculated by using the Monte Carlo ray-tracing technique,considering the model principle errors,non-parallelism of solar rays,tracking error,the shadow of receivers etc. The paper also studies the influence of different combination forms,ring number,focal diameter ratio and tracking error on the radiation flux density on the receiving surface,providing a basis for parameter selection and focusing performance analysis of parabolic solar concentrator in triangular membrane facets.