In this paper, a fiber-optic sensing system for simultaneous measurement of temperature and transversal loading based on a fiber-ring microwave photonic filter (MPF) has been proposed and experimentally demonstrated. The temperature variation will induce the central frequency shift of the MPF's passband, while the micro-bend loss induced by transversal loading will cause the change of extinction ratio of the MPF. Hence, by tracking the central frequency and extinction ratio of the passbands, temperature and transversal loading can be monitored respectively. The proposed sensing system enjoys high sensitivity, remoting sensing, good multiplexing capacity, thus shows a good prospect in practical applications.