Abstract: To address the stringent requirements for ultra-high-temperature molten salt pumps (operating temperature \geqslant 700 °C) in extreme conditions—including resistance to strong thermal radiation interference, overcoming signal drift and component thermal deformation in high-temperature environments, and ensuring long-term, highly reliable operation—a distributed control system based on EPICS was designed and implemented. Combined with the MQTT (Message Queuing Telemetry Transport)protocol and Unreal Engine (UE), a cross-regional 3D visualization monitoring platform was constructed. To meet the demands for high precision, high reliability, and real-time performance in high-temperature environments, the system adopts a layered architecture (supervisory layer, control layer, field layer). A distributed real-time control and monitoring system was built upon the open-source EPICS framework, featuring a design where the EPICS IOC (Input/Output Controller) operates simultaneously as both a real-time controller and a data transmission middleware. Industrial-grade I/O modules based on the EtherCAT bus were employed, leveraging their excellent anti-interference capability and nanosecond-level synchronization accuracy. This effectively ensures high- precision, high-speed data acquisition and control signal transmission in complex high-temperature flow fields. Engineering applications demonstrate that the system maintains continuous stable operation under 700 °C high temperatures and complex flow fields. Compared to traditional solutions, it significantly enhances human-machine interactivity, reduces operational response time to <1 s, and lowers data synchronization error to <0.2% (within full scale range). This provides a highly reliable and high-performance control system technical solution for the testing and validation of key components in fourth-generation (Gen-IV) nuclear reactors.