High temperature superconductors are ideal materials for use in extra high magnetic fields owing to their capability of transporting high-density DC current with little power loss. Hence, superconducting magnets are already widely used in areas such as magnetic resonance imaging (MRI), particle accelerators, and magnetic levitation systems. Flux pumping is a promising technology for energizing and operating High-Tc superconducting magnets in a relatively cost effective manner. This thesis first presents a thorough study on the dynamic resistance, the key driving force of the flux pumping phenomenon. Furthermore, it provides a brand new method to differentiate the dynamic resistance stage of High-Tc superconductors from the flux flow stage, which is necessary for superconducting devices to take advantage of the dynamic resistance in complex environment. It then proposes a novel design for a dynamic bridge which is capable of significantly improving the performance of energizing High-Tc superconducting magnets. Based on the existing flux pump technology, the author has worked out key technology of the flux pump to lay a solid foundation for future flux pumped high field superconducting magnets. This thesis can serve as a useful guidebook for researchers in the area of flux pumped superconducting magnets.