Under mixed computing environment of grid and P2P(Grid & P2P), grid nodes provide the service with QoS guarantee However, sharing computing resources of P2P nodes is the user's volunteer action without QoS guarantee The user is not responsible for his actions Therefore it's difficult to establish the trust relationship among users with traditional trust mechanism Referring to social people trust relationship models, a grid & P2P trust model based on recommendation evidence reasoning is designed to solve the...