The BEPCII cryogenic system mainly provides a liquid helium-temperature cryogenic environment for the collider's superconducting equipment,including the superconducting magnet cryogenic system and the superconducting radio-frequency (RF) cavity cryogenic system. The superconducting magnet cryogenic system serves the Beijing Spectrometer BESIII superconducting solenoid magnet (SSM magnet) and two superconducting insertion quadrupole magnets (SIM magnets);the superconducting cavity cryogenic system meets the cryogenic requirements for the superconducting radio-frequency (SRF) cavities. Both the superconducting magnet cryogenic system and the superconducting cavity cryogenic system are equipped with helium and liquid nitrogen storage tanks,4.5K helium refrigerators,liquid helium dewars,cryogenic distribution valve boxes,cryostats for superconducting equipment,and liquid helium/liquid nitrogen transmission pipelines.