Abstract: DOA algorithm widely used in ultrasonic imaging is susceptible to the inhomogeneity and multi-path of the medium. Therefore,the range resolution is poor. Based on time-reversal method,a new imaging algorithm motivated by time-reversal mirror in random medium is proposed. The new DOA-AT imaging algorithm performs as the following steps: (i) Arrival time analysis of the received echo from the scatters; (ii) Singular value decomposition of the array response matrix in frequency domain; (iii) Combination of the DOA estimation of target function in time domain and the Arrival Time estimation that results in DOA-AT estimation algorithm.