If Software-Defined Networking (SDN) is deployed on the ambulance, the doctor / care giver could remotely diagnose / take care of the patient after the patients are onboard. The patient get more chance to survive. After analyzing how to present patients earlier care, this paper’s goals are to (1) enable an ambulance to transport the patient to hospitals as early as possible (2) ensure the paramedic provide care earlier via SDN. A set of graphic algorithms have been proposed and the experimental results demonstrate the feasibility of our solution. Categories and Subject Descriptors C.2.0 [Computer-Communication Network]: General − Data communications; G.2.2 [Graph Theory]: Graph Theory − Graph algorithms, Network problems; K.6.0 [Management of Computing and Information System]: General − Economics. General Terms Algorithms, Measurement, Performance Keywords Ambulance, Emergency Medical System, Mobile Ad hoc Networks, Software Defined Networking.