Abstract: To explore the difference in the biodegradation performance of a new type of masks under two composting conditions： aerobic and anaerobic， the biodegradation rates of the masks were obtained through the measurement according to the internationally recognized standard methods. The statistical results indicated that this type of masks exhibited biodegradation rates of 66.4 % and 21.2 %， respectively， on the 90th day under the test conditions of ISO 14855?1 and ISO 15985. This indicated that the masks had much better biodegradation performance in aerobic conditions than that in anaerobic conditions. This new type of masks may be more suitable for disposal with aerobic industrial composting devices after discarded.

Key words: new type mask, biodegradation, compost