Abstract: In order to reflect and improve the overall performances of industrial robotic belt grinding systems,the concept of working accuracy and its measurement method are proposed after analyzing the characteristics of industrial robot application systems.Based on this concept,the working accuracy model for the robotic grinding system is established and a novel method is proposed for measuring and compensating the working error.Meanwhile,a real robotic belt grinding system is built.The effectiveness of the proposed method is verified by experiments on a real robotic grinding workcell.