The invention discloses a mobile service quality maintaining method based on context prediction. According to the method, the following parts are provided: a mobile service access model based on session state increment backup and periodic response, a session active switching model based on context prediction and service quality available thresholds (network thresholds and calculation thresholds), and a session self-adaptive quick restoring mechanism based on scenes. The advantages of the method are that the service disaster tolerance capability, service quality stability and development trend are taken into full consideration, continuity of sessions is ensured through transparent and quick switching, the service availability problem of a conventional mobile communication environment is solved, and services can extend into mobile environments.