Objective: Metrological verification for the medical emergency vehicle terminal 3G system, in order to facilitate the accurate positioning, route correctly, timely treatment, high success rate, and increase the credibility and effectiveness of treatment process records provided in the verification process or perform the burden of adducing evidences for emergency first-aid course. Methods:Metrological verification the positioning error, azimuth error and velocity error of emergency medical 3G system terminal. Results:The vehicle terminal measurement device and measurement method, which can satisfy the requirements of verification terminal technology and provide a valid certificate. Conclusion:Metrological verification has the very good function to emergency medical vehicles to successfully treat patients and subsequent verification and perform the burden of adducing evidences.