In order to make equipment run safely,economically and continuously,some new maintenance models were put forward to improve the equipment after-sale maintenance service,such as E-maintenance,third-party maintenance,etc.To certain extent,the models solved the problem of the distance between the manufacturer and customer and the dispersion of the maintenance technologies,however,those resources are still widely distributed and do not collaborate efficiently.In this paper,a network-based collaborative maintenance service model was proposed for after-sales equipment to solve the problem of maintenance resources integration.Concretely,equipment designers,maintainers,spare parts suppliers and maintenance experts were grouped together to establish dynamic alliance.The leader of the alliance is the manufacturer under guaranty period or equipment user exceeding the guaranty period.The process of maintenance service was divided into three stages which are fault diagnosis,maintenance decision and maintenance implementation.The sub-alliances were established to carry out maintenance work at each stage.In addition,the business process of network-based collaborative maintenance was analyzed and collaborative business system for equipment’s after-sales collaborative maintenance service was designed.In the end,an informational economics model of network-based collaborative maintenance was established to demonstrate the effectiveness of this maintenance model. In order to make equipment run safely, economically and continuously, some new maintenance models were put forward to improve the equipment after-sale maintenance service, such as E-maintenance, third-party maintenance, etc.To certain extent, the models solved the problem of the distance between the manufacturer and customer and the dispersion of the maintenance technologies, however, those resources are still widely distributed and do not collaborate efficiently.In this paper, a network-based collaborative maintenance service model was proposed for after-sales equipment to solve the problem of maintenance resources integration.Concretely, equipment designers, maintainers, spare parts suppliers and maintenance experts were grouped together to establish dynamic alliance. The leader of the alliance is the manufacturer under guaranty period or equipment user exceeding the guaranty period. process of maintenance service was divided into three stages which are fault diagnosis, maintenance decision and maintenance implementation. The sub-alliances were established to carry out maintenance work at each stage. In addition, the business process of network-based collaborative maintenance was analyzed and collaborative business system for equipment’s after-sales collaborative maintenance service was designed.In the end , an informational economics model of network-based collaborative maintenance was established to demonstrate the effectiveness of this maintenance model.