This paper studies the time-domain autocorrelation matching method for reducing the Peak-to-Average Power Ratio（PAPR）of the Orthogonal Frequency Division Multiplexing（OFDM）system.The main idea of this method is to add a random sequence generator in time domain

in which the random sequences are overlapped to the original signals so as to reduce the PAPR of the system and perform blind detection at the receiving end.As the signal processing in this method takes place in time domain

the computational complexity can be reduced in just one IFFT operation.Simulation results indicate that similar PAPR and Bit Error Rate（BER）performances can be acquired in this method to those in traditional SeLecting Mapping（SLM）method but the computational complexity is much more mitigated

thus verifying the effectiveness of the proposed method.