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Without measurement,there would be no science.Modern science is established and developed in the process of hypothesis-test-model-theory cycle.Physics and measurement are inseparable.Precision measurement refers to the use of advanced technology and methods to pursue high accuracy under the existing physical framework.Precision measurement physics is to test the range of existing physics in a higher precision and try to find out the limit of the frame so as to discover new physics.In other words,precision measurement physics is the physics that precision matters.It is well known that an improvement of measuring precision in physics by an order of magnitude often leads to new physical discoveries.Early observations of the atomic separate line series gave birth to quantum mechanics,and the fine structure of atomic spectrum and the discovery of Lamb shift laid an experimental foundation for the birth of relativistic quantum mechanics and quantum electrodynamics(QED),respectively.