To cope with the circumstance without considering wideband for the DOA estimation method under SαSnoise, on the basis of analyzing the character of wideband array output matrix in SαS noise, the temporal method and the frequency domain method are combined by constructing every frequency band of fraction cumulant of the L-shape array, which could extend 1-dimension wideband signal to 2-dimension. Meanwhile, using the CSM focusing method, the direction matrixes at different frequencies are transformed to matrixes at the same reference frequency of matrix by k focusing matrixes, and the improved MFLOM is adopted as the estimator of co-variation matrix. Thus the 2-dimension DOA estimation of wideband signal under SαS noise is realized. The algorithm is effective through simulation and analysis.