The 2021 CIE International Conference on Radar (Radar 2021) will be held on December 15-19 in Haikou, Hainan, China. Radar 2021 is one of the international radar conference series which is held separately in USA, China, UK, Australia and France. This conference aims to introduce the latest technological development and academic research of hot issues. The conference topics of Radar 2021 will cover all aspects of radar system for civil or defense applications. The professional theme of Radar 2021 is “Innovation Shape the Future”. It is our great pleasure and honor to invite you to share the most recent ideas and achievements related to radar techniques here. All accepted papers will be published in the conference proceedings