Abstract: The reliability of 2D C/SiC composite was investigated by the methods of probability together with statistics, including the analysis of flexural strength, the comparison of calculated failure probabilities with experimental data and the prediction of reliabilities, hazard function and reliable strength. The linear regression analysis and the test of goodness of fit for 2D C/SiC composite indicate that the normal, logarithm normal and 3-parameter Weibull models can well characterize the flexural strength. The parameters in the mathematical models of failure probability function, reliability function, hazard rate function and reliable strength function of this composite were developed, so that the failure probability, reliability and hazard rate can be calculated in the case of a given flexural strength, and also the reliable strength can be calculated in the case of a given allowed reliability. The maximum relative error of median strength between models prediction and experiment is 0.07%, and the calculations of failure probability compare satisfactorily to experimental results.