The national standard safe use period is 4-6 years. In March 2004, the National Standards Committee and the State Sports General Administration jointly issued the mandatory national standard "General Requirements for the Safety of Outdoor Fitness Equipment": the safe service life of horizontal bars and parallel bars is two years; Equipment with rotating, swinging or sliding parts and other movable parts has a safe service life of 4 years; The safe service life of other stable equipment without any moving parts is 6 years. The fitness equipment produced by Jianning Sports is produced according to national standards.