The technology of the radar electronic countermeasure (RECM) is developing by the application of the radar technology. With the extensive use of the cut-edge radar system, the traditional blanket jamming hardly has effect on the hostile radar, and the research direction of radar jamming has gradually changed from high-power blanket jamming to smart jamming. These new jamming technologies have the characteristics of precision, dexterity, low power and distribution. In this paper, the radar distributed jamming technology is analyzed as a whole, and the common technology methods of distributed jamming are summarized. Firstly, the establishment of radar detective area and the influence of multiple interference sources on radar detective area are discussed, and then the algorithms commonly used in radar jamming resource optimization allocation are analyzed. Finally, the future development direction of distributed radar jamming is prospected.