[Xiong, L. Y.
; Liu, L. Q.
; Zhang, L.] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China
; [Li, S. P.
; He, K.] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
BEPCII cryogenic system consists of a cavity cooling loop and a magnet cooling loop. Although the magnet cooling loop has lower heat load than the cavity cooling loop, it needs much more helium mass flow since only sensible heat of the supercritical helium is used to cool the SCQ magnets. As a result, excess liquid helium exists in the return line of the magnet cooling loop and should be evaporated by electrical heater, leading to a waste of cooling power. This paper discusses several solutions for operating the system economically.