Abstract: For the problem of secure transmission in physical layer with multiple eavesdroppers randomly distributed in time reversal system, a secure throughput optimization scheme is put forword.The scheme?is based on multiple input single output transmission?with?artificial?noise-aided?time?reversal.?Firstly, the?closed-form expressions of connection outage probability and security outage probability are derived by using random geometry theory to characterize the reliability and security of the system of respectively. Next, considering the reliability and security of the system, an optimization scheme is proposed to maximize the security throughput. Finally, Simulation results show that the proposed scheme improves the system’s security throughput compared with other schemes.