Abstract: The present article reviews the advances of chemical looping ammonia synthesis（CLAS） based on hydrogenation and regeneration of nitrogen carriers. The key factors in challenging the ammonia production as well as the strategies for enhanced nitrogen carriers performance are proposed. The preparation methods of nitrides are overviewed, and the nitrogen carrier performance control is evaluated objectively, in order to provide guidance for nitrogen carrier mediated chemical chain synthesis of ammonia and promote the transformation of basic research into industrial technology.