In high accuracy aeromagnetic survey, the magnetic interference of aircraft must be effectively eliminated, and the method is compensation flight. The compensation has a direct influence on the flight data quality of geophysical exploration; nevertheless, because China's magnetometers have different models, so how to perform unified evaluation is very important. According to the specification, the criterion of aeromagnetic survey (DZ/T1402-2010) provides specific measures for assessing the performance of digital magnetic compensation; nevertheless,it does not define the method of quality assessment. This paper introduces the parameter of IR and three components as well as different directions of flight so as to verify the effect of compensation.