One type passenger oxygen mask used in civil aircraft is made of polymer materials such as rubber and plastic. This paper has an analysis of these materials aging. These materials will age and then fail influenced by external factors such as heat, light, mechanical stress and ozone. After the analysis of the mask installation environment, it is determined that the thermal environment is the main factor that causes mask age accelerating. Accelerated thermal aging and the Arrhenius Equation is a common mean to study the life of rubber and plastics. This paper brings up an efficient method to predict mask life. It is to use accelerated heat aging test to predict life and evaluate the degree of deterioration of mask function. The results showed that at normal storage and use conditions (21 °C), the life of the mask is 8.38 years, which is similar to the congeneric products.