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We propose a model built with COMSOL Multiphysics to acquire blood velocity whic can reflect much internal health information for human body.The model contains a isothermal heat resource and a temperature sensor.The average temperature on surface of tl thermal sensor will vary as the blood velocity changes.We can acquire blood veloci through curve fitting.Based on the normal amount of blood vessel, blood flowing directic and blood vessel diameter, we analyze how these three parameters affect veloci measurement.