With the emergence of new applica-tions and the increasing cost of new semiconductor manufacturing technology, high energy-efficiency and flexibility are both critical for processors. Dynamically reconfigurable computing architecture, which has the both characteristics, is one of the most promising architectures for future processors. It has shown notable advantages in many important application fields, compared to conventional architectures. However, the fundamental reasons for the characteristics have never been deeply discussed in previous papers. This paper analyzes the reasons from the perspective of design methodology. The technologies of dynamically reconfigurable computing are continually evolving, and some cheering results of application have been achieved. This paper summarizes the latest progress in key technologies and provides an introduction of the application achievements.