Abstract: In order to further study the Mesozoic sedimentary formation in the Southern East China Sea shelf basin, the research and application of wide-line seismic acquisition and processing technology for stereo source was carried out. The results show that the quality of the obtained seismic data is excellent, which is mainly reflected in the following aspects:increase of low-frequency information of the data, the obvious characteristics of deep reflection wave group, the improvement of signal to noise ratio of the data, and the good transverse continuity of the data. The seismic acquisition of the sea towing cable wide line is an economical, practical and effective technique for improving the quality of seismic data in the middle and deep strata, and strengthen the effect of seismic prestack migration imaging of Mesozoic strata in the Southern East China Sea.