Abstract: In the complex multipath environment, in order to improve the detection ability of radar system for target signal and reduce the use of space and time in the sampling part of the receiver, a target signal detection scheme combining time reversal and compressed sensing is proposed. Firstly, the space-time focusing characteristic of time inversion is used to reduce the influence of multipath effect and focus the target signal energy. Then, a new compressed measurement matrix is designed, which has certain noise reduction characteristics and does not need to reconstruct the signal. The compressed measurement samples are directly processed for detection. Theoretical analysis and simulation results show that the proposed scheme has advantages in noise, reducing the impact of multipath environment and reducing the pressure of signal processing.