The General Administration of Quality Supervision, Inspection and Quarantine issued Announcement No.34 of 20 17, and cancelled the production licenses of industrial products of 2,593 enterprises, including the production licenses of gas cookers of 59 enterprises and gas water heaters of 20 enterprises. The reasons for the cancellation of production licenses of these enterprises are mainly concentrated in the following four aspects: First, enterprises are terminated according to law; Second, enterprises apply for cancellation; Third, the production license has not been extended after its expiration; Fourth, enterprises no longer engage in production activities of listed products. There are many cottage factories and well-known enterprises selling certificates, with the largest number of Guangdong enterprises in the region.