In order to improve the problem of poor positioning precision of underground personnel

a wireless sensor networks（WSNs）positioning algorithm based on tunnel partitioning and chicken swarm optimization（CSO）is proposed.Divide the area between two adjacent anchor nodes equally

mark the areas according to the RSSI values of nearby anchor nodes

and determine the area to which the unknown node belongs according to the RSSI value received by the unknown node.The improved CSO algorithm is used to determine the exact location of unknown nodes through iterative optimization in this area. Simulation results show that the proposed algorithm performs well in terms of anchor node density and ranging error.