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Indoor location technologies are valued for its favorable using in search, rescue and safety. The paper introduced the RFID positioning system used in the management of prison inmates, mainly revolved round its operational principle and relevant subsistent positioning algorithm, a depth study in LANDMARC was carried out. According to the algorithm’s shortcomings, Optimizing and improving in reader’s positional distribution, reference tag’s distribution density and selected the number k of reference tag to get better improving LANDMARC algorithm. The improving algorithm simulated by Matlab7.0, raising the position accuracy of prison inmates indoor, ensuring the safety of the prison, improving the efficiency.