Abstract: The room temperature tensile properties of Mo-30Cu alloy was investigated and its fracture morphology was observed Cold rolling test was carried out to study the change in microstructure of Mo-30Cu alloy with different deformations The results showed that the room fracture of Mo-30Cu alloy was composed fracture of copper binder, separation of molybdenum/copper binder interfaces, and cleavage of molybdenum particles. Cleavage of molybdenum particles and separation of molybdenum-copper binder interfaces made cracks in Mo-30Cu alloy during cold rolling at room temperature.