Abstract: Positron emission computed tomography (PET) is a molecular functional-level imaging technique that can reflect the functional metabolism of an aspect of the body through the development of a specific tracer injected in the body. In recent years, the application values of PET diagnosis has been more and more clinically recognized, and the imaging system has also developed rapidly, like a variety of functional PET instruments have been developed and introduced. In 2017, the world's first panoramic dynamic scan PET/CT (axial vision Field is 196.6 cm) launched at home. Therefore, this paper will review the technical developments of PET/CT in recent years and the breakthroughs of dynamic scanning PET/CT.