In view of the problem of high-temperature heat hazard caused by poor ventilation deep in Linglong Gold Mine,the optimization scheme of the ventilation system in Jiuqu sub-mine of Linglong Gold Mine is determined by means of field investigation,calculation of total air volume,optimal setting of fan station and newly-added ventilation shaft and roadway engineering.The research results show that through the newly excavated -470 m to -620 m level return air shaft project in Jiuqu ore block,a two-in-three-return ventilation mode was formed with air intake from the main shaft and auxiliary shaft,and return air from the east and west wings and the reverse section of Line 55 in the middle.At the same time,return fan stations are set at the return air shafts in the -620 m level (east wing) of Jiuqu ore block and -620 m level (west wing) of Dakaitou ore block and Line 55 (central) of the -620 m level.The total air volume of the system reaches 204.7 m3/s through Ventsim 3D ventilation simulation software calculation,which can meet the requirements of deep ventilation.The research results lay the foundation for the optimization of deep mining systems.