Abstract: Three existing mine network structures of Line structure, Meshroof structure and Meshchain structure were analyzed and compared in details, and a Line-2 network structure of 2-coverage and 2-connectivity was designed to optimize configuration of underground wireless network sensor nodes based on Line structure and Meshroof structure. The simulation results showed that the coverage redundancy of Line-2 network is lower than Meshroof network, and Line-2 network has more simple structure, and better adaptability to coal mine environment.