The conventional HVDC converter valve closed cycle cooling system based on the combination of environmental conditions of high temperature and drought area, using composite cooling chillers, cold storage and air cooler combination, and according to the ambient temperature are given different cooling strategies accordingly, were used in the analysis of the different environmental conditions composite cooling method, the analysis result is validated through experiment, achieved the corresponding air cooler, refrigeration and cold storage tank cold loading and reverse unloading function according to the valve inlet temperature, make the system more reasonable and logical control is more direct, higher degree of automation, reliability, improve the cold exchange equipment valve of environmental temperature adaptability, to ensure the normal work of HVDC converter valve.