Aiming at the observed degradation data of the one-dimensional performance of the products, the proportional hazard model is applied to describe the relationship between the product's life span and its degradation failure rate. The proportional hazard degradation model is built to derive the product's reliability function. The Anderson-Darling (AD) test method is used to determine the degradation distribution model. The most common degradation distribution type at the time points of observing is chosen as the basic distribution to obtain its basic failure rate function and the proportional coefficients. An example is given by using the degradation data of a certain laser to verify the effectiveness of the proposed model.