In the beginning of this century (1908), the Netherlands physicist Onnes first found superconductor. Four Nobel Prize related to lowtemperature superconductors. Nearly a century only directly to the phenomenon of superconductivity,the most important component of which is the Josephson effect of the discovery and application within. 1962. on the two superconductors must be a thin layer of separation of the S-I-S, theoretically predicted that the Josephson effect. when the voltage is zero at both ends, there can be a very smal current. This is the electronic currents of the tunnel. The critical current density depends on the magnetic field. This phenomenon known Josephson as the DC Josephson effect. When the ends of the DC voltage is equal, there are still lines of supercondisting electronics tunnel current, but this is a superconductor of alternating current,this phenomenon known as the exchange of large-sum effect of Josephson. This paper briefly described the Josephson effect and the discovery process,the Josephson effect on the content of the primary method use are AC Josephson formula of DC Josephson effect and the exchange of the Josephson effect principle, characteristics and applications.
Keywords：Superconducting, DC Josephson, AC Josephson, Phase
