Ammonium dinitramide (ADN) has been proved to be a very promising oxidizer in propellant,and has caused people extra attentions in the field of high energy density materials. In this paper,synthesis,properties and application of ADN in propellants are reviewed and discussed in some detail. The data in literature show that ADN possesses advantages of high energy,low signature,and friendly to environment. In comparison with the flake ADN,the prilled ADN is much better in some aspects,such as thermal stability,hygroscopicity and mechanical sensitivity.