The terahertz band is between microwave and infrared and has many unique advantages, such as the ability to penetrate many substances and lower photon energy. This makes terahertz technology promising for a wide range of applications in the fields of biomedicine, security detection, and communications. Terahertz radiation source is the core component of terahertz technology, and its development level directly determines the performance and prospect of terahertz technology in various applications. The 46th International Conference on Infrared Millimeter Waves and Terahertz focuses on the latest research results of terahertz radiation sources and demonstrates important progress in new radiation sources, integration technology and optimized design. This paper summarizes and shows the cutting-edge research content and directions of different types of terahertz radiation sources based on the reports of recent international conferences related to infrared millimeter wave and terahertz. These results lay a solid foundation for the further development of terahertz technology in various applications.