The southwest Huizhou area in Pearl River Mouth Basin is the preferred target for lithologic trap exploration in the northeastern continental shelf of South China Sea. Nearly100 million square meters of petroleum geological reserves have been found in lithologic reservoirs. The analysis of forming conditions for lithologic traps and its developing types is beneficial to clarify exploration direction and enhance exploration potential of lithologic trap in marine sedimentary of the continental shelf. Influenced by multi-stage origin，relative sea-level change and complex hydrodynamic environment，multi-genesis sand bodies formed at Neogene paleo-Pearl River Delta are characterized by zonal development and vertical overlapping of multi-layer reservoir-cap assemblages，which are the material basis for lithologic traps development. Dongsha Movement makes Dongsha Uplift rise upper at the late Neogene and faults relatively develop，which provides tectonic background for lithologic traps formation. The lithologic traps in the southwestern Huizhou area distribute in three belts which are delta plain，delta front，and belt sand development zone. The channel sand bodies mainly develop in delta plain.The lithologic updip pinchout traps mainly develop at delta front，which can be further subdivided into three categories：the end sand body of progradation，the inner sand body of progradation，and the sand body of retrogradation. The strip sandstone traps develop mainly in strip sandstone development belts formed under the limited paleogeomorphic background.Based on the analysis of the development location，pinchout characteristics and reservoir physical properties of different types of traps，it is concluded that the lithologic updip pinchout traps of the sand bodies of retrogradation have the best reservoir physical properties and trap boundary conditions.