Abstract: In order to achieve high efficiency grinding of high strength steel surface, the structure of a brazed diamond grinding disc was designed, and the wear reliability of abrasive tool under the interaction of friction and heat was predicted. Firstly, the material removal function model of brazed diamond grinding disc was established by grinding trajectory and contact zone characteristics. Then, white noise was introduced into the traditional wear analysis model to represent the dynamic and stochastic factors of grinding process. The wear dynamic reliability model of brazed diamond wheel was established by applying Wiener process theory and limit state equation. The estimation method of important statistical characteristic parameters in the model was given. Finally, the abrasive wear reliability and life characteristics of brazed diamond wheel grinding AH32 carbon rigid were calculated. The results showed that the average service life of the grinding disc under continuous grinding was more than 15 h, and the reliability curve first decreased slowly, then sharply, and then slowly with time. The process parameters such as rotational speed, feed speed, grinding depth and abrasive grain size had important effects on the life of abrasive tool. The reliability of brazed diamond grinding disc was directly proportional to the product of rotational speed, feed speed and grinding depth. This study could provide theoretical basis for quantitative life assessment and strength optimization design of advanced welding abrasive tools.