The DIXE mission on board the Chinese Space Station will integrate high-resolution X-ray spectroscopy with X-ray sky surveys, addressing a gap in this area at the international level. Scientifically, DIXE aims to investigate the origin and evolution of the Milky Way's hot baryons, advancing major frontier research on the galactic ecosystem. In terms of key technology development, the project will pioneer the development of superconducting Transition Edge Sensor (TES) microcalorimeter arrays, SQUID-based Frequency-Domain Multiplexing (FDM) readout systems, and space cryocooler system (including mechanical coolers and adiabatic demagnetization refrigerator). These advancements will pave the way for Chinese long-term space astronomy project, the Hot Universe Baryon Survey (HUBS).