Abstract: We summarize three kinds of data often occurred in experiments which are done to estimate the product's radiation hardening (RH) performance. A method based on Bayesian theory is proposed in this paper. This method is applied to evaluate the product's RH performance if the product's RH performance abides by the lognormal distribution and the samples are Zero-One data. The prior distributions of unknown parameters are also discussed, and two examples are given to illustrate the proposed method.