Abstract: As the key technology for spatial location acquisition of the things，RFID technology will be widely used in the Internet of Things.In the paper，the applications of the RFID in the Internet of Things and the key issues to be resolved are discussed.It proposes an improved algorithm using RFID and a simulation of the positioning error for underground straight tunnel is made.The results show that the positioning accuracy of the improved algorithm can meet the needs of target location underground.

Key words: Sensor mine, Internet of things, RFID, Digital mine, Underground personnel location