The common two- dimensional DOA estimation algorithms are mostly based on circular signals，andrequire a large number of slap shot and array elements，and the performance of estimation at low SNR is poor． Byutilizing the characteristics of the noncircular sources and the structure of the L- shape array，a 2- D DOA estimationmethod for coherent noncircular sources is proposed． Firstly，both the array received signal data and its conjugatesignal data are exploited to form a reconstructed received covariance matrix，so that the array aperture is enlarged．Then，a modified space smoothing method is proposed to de- correlate the coherent data，and the ESPRIT algorithmis adopted to estimate the DOAs． The proposed method is effective at small array element number and low slapnumber，in which the common ESPRIT algorithms fail to estimate． Moreover，it can improve the estimation per-formance at low SNR as well． Simulation results show that the proposed algorithm can estimate coherent sources ef-fectively and has much better performance than that of common ESPRIT algorithms．