Abstract: In the structural design of composite materials, the allowable value is one of the key parameters. The statistic of B basis is usually used as the allowable value of composite materials, and the B basis is the lower limit of 90% confidence with 95% confidence. Accurate calculation of the B basis of composite materials is the guarantee for the safe and reliable application of composite materials. This article summarizes the research progress of the calculation method of the composite material’s B basis, and analyzes in detail the calculation principle, calculation process and applicable conditions of the single-point method and the pooling method. And combined with the project data, the influence of different methods on the calculation results of the B basis is analyzed. Finally, the development trend and expected research direction of the calculation method of composite material B basis are prospected.