The breathing mask is an important channel for the gas to enter the body during the patient's non-invasive ventilator ventilation.Based on the accumulation of experience in the evaluation of breathing mask products and the compilation of the Guiding Principles for the Technical Review of Breathing Mask,this study analyzed the main attentions of breathing mask products in the technical evaluation.Including the main performance indicators,biocompatibility evaluation,product disinfection and sterilization research,etc.In order to provide reference for the registration and technical evaluation of breathing mask products.