The Josephson parametric amplifier is the key to superconducting quantum computing experiments. This article introduces its basic physical principles and provides a detailed discussion on the device physical characteristics, implementation design, and development of Josephson parametric amplifiers. Finally, based on practical experimental experience, an effective method for determining the optimal operating point of Josephson parametric amplifiers was proposed. This article helps readers interested in superconducting quantum computing to comprehensively grasp the experimental methods and system composition of superconducting quantum computing, and has certain reference significance for the design of extremely low temperature signal amplifiers.