Abstract: For the vulnerable and broken rock mass,a variety of support construction techniques have been formed,greatly ensuring the safety of roadway excavation and use.Due to the unique geological and metallogenic type in Jiama Copper Polymetallic Mine,there are a large number of unfavorable engineering geological bodies in the roadway excavation construction,which has caused great difficulties in the safe construction and use of underground engineering.Based on the thorough study of the engineering geology of vulnerable and broken rock mass in Jiama Copper Polymetallic Mine,this paper puts forward the reinforcement methods of fractured rock mass,such as medium-long hole grouting,small pipe grouting,advanced small pipe shed,etc.,and finally forms the composite roadway support structure,which has been successfully applied in the development and support process of Jiama Copper Polymetallic Mine and has achieved good engineering effect.