Songxi-Songdong transfer zone in the northern Qiongdongnan Basin was analyzed with seismic reflection data and the balanced cross-section technique to understand the generation and evolution of the convergent overlapping transfer zone in rift basins. Consequently，it belongs to the convergent overlapping transfer zone between faults 5 and 6. Its evolution has gone through four tectonic stages：initial development（Eocene），stereotyped development（depositional period of Yacheng Formation），stable development（depositional period of Lingshui Formation），and extinction（depositional period of Sanya Formation）. According to the existing genetic theory of transfer zones and the results of balanced cross-section analysis，it is considered that Songxi-Songdong transfer zone is generated mainly from the segmented growth of faults 5 and 6，and its generation and evolution processes can be explained by the theory of stress reduction zones. During the chasmic stage，Songxi-Songdong transfer zone is always tectonically high and can entrap and accumulate hydrocarbon generated by the sags on both sides. In addition，the storage and reservoir can be effectively enhanced by the plentiful secondary faults formed under the influence of the stress reduction zone and the weathering and erosion during the uplift stage of the basin.All these signal the extremely favorable conditions for hydrocarbon accumulation.