Abstract: Capillary discharge plasma is a new type of high pulsed energy particle source which is recently developed. Plasma jets with high temperature, high density and hypervelocity can be produced by high voltage discharge between two electrodes of a capillary. It can be used for projection of microparticle, acceleration of powder material and ignition and heating of chemical propellant. Such a technique has wide applications in industry, science and national defense. This paper presents the basic theory and characteristics of capillary plasma jets and introduced the research status quo and its applications so that this technology can be paid attention to by people and developed in our country.