UHV series compensation system primary equipments are expensive, complex, and with a variety of fault types, so its protection and control devices are very different with conventional protection devices both in hardware and software requirements. To reflect the fast-changing currents such as MOV current and gap discharge current, the real-time requirement for the series compensation protection and control system is very high. Based on the analysis of the series compensation system protection and control devices’ function configuration and performance requirements, it proposes the hardware and software design solutions for the series compensation system protection and control device. From using modular design for the hardware, every module is independently designed based on its performance needs, such as analog input and processing, protection logic operations, communications and human-machine interface modules, it can achieve maximum efficiency and better stability. From using hierarchical modular design for the software, underlying software design and debugging by the professional design department, complicated application-layer software using visual programming environment, making the various protection functions and algorithms modular, visualization, it reduces the probability of programming mistakes and improves the operating stability of the device. Through the static and real-time digital simulation instrument (RTDS) simulation testing, the action behavior and performance of the series compensation protection and control device developed meets the design requirements and relevant industry standards.