Abstract: In order to find a suitable crushing and grinding process for a large molybdenum mine in Ji⁃ angxi Province，according to the mine construction scale，ore properties，falling weight test and high pres⁃ sure roller test results，three kinds of crushing and grinding process of the SAB crushing and grinding pro⁃ cess of semi-autogenous grinding + ball milling，the conventional crushing and grinding process of medium crushing + fine crushing + screening + ball milling，and the high pressure roller crushing and grinding pro⁃ cess of medium crushing + closed dry screening + high pressure roller grinding + closed wet screening + ball milling are analyzed and studied. The comparison of project investment，operating cost and cost present val⁃ ue is carried out.Considering the research results，advantages and disadvantages of the three crushing and grinding processes，the current situation of the mine，construction conditions and development needs，it is recommended that the molybdenum mine adopt the SAB crushing and grinding process.

Key words: molybdenum ore, crushing and grinding process, SAB, high pressure roller mill