Up to now, in the geological community, it is generally believed that the low-angle rift basin was formed by low-angle normal detachment fault, and it can be divided into two genetic models: supradetachment breakaway model and supradetachment ramp model. In this paper five kinds of genetic models of low-angle normal fault are introduced and reviewed. Taking Enping low-angle fault depression of Pearl River Mouth Basin as an example, based on the 3D seismic profile interpretation and balanced cross-section restoration, this paper proposed a new model: negative reversion took place after the pre-existing low-angle reverse fault. It is shown that the different genetic basins have different structural characteristics. Low-angle supradetachment basin with shallow lake experienced minor post-rift subsidence, while low-angle negative reversion fault basin with deep lake underwent prominent post-rift subsidence, and the former tend to have no exploration potential, but the latter has a huge exploration potential.