A discussion on all aspects of the dynamic calibration，dynamic test and dynamic measurement is presented.From the view of object,target,purpose, result and form? essence,and precondition,both the differences and common grounds are discussed in detailed.They can be used to identify the characters of measurement works. Meanwhile,how to use the dynamic performance of measurement equipment is introduced.By using the method in this paper,it’s easy to determine whether they belong to calibration,test or general measurement.?