The application of high sulfur-cobalt salt adhesion system in the belt compound of PCR tire was investigated.The results showed that,by using high sulfur-cobalt salt adhesion system in the belt compound of PCR tire,the modulus at 200% and 300% elongation and tensile strength of vulcanizate were increased,the adhesion property between vulcanizate and steel cord was kept,the dynamic property of vulcanizate was improved,the high-speed performance and endurance of finished tire were improved,the production cost was reduced,and the working environment was improved.