1. Introduction; 2. Digital Coding Metamaterials; 3. Anisotropic Digital Coding Metamaterials; 4. Programmable Metamaterials 5. Information Processing on Digital Coding Metamaterials; 6. New Imaging Systems Based on Programmable Metasurfaces; 7. Time-Domain Digital Coding and New-Architecture Wireless Communication System; 8. Summary and Outlook.