There are complex hydrocarbon accumulation conditions in Huanghekou sag，Bohai Sea. The systematical analysis of fault control effect on hydrocarbon accumulation is conducive to guiding further hydrocarbon exploration in the area.Based on the analysis of faults characteristics of the central structural ridge in Huanghekou sag，including fault extension length，density，fault throw in individual geologic period，fault activity rate，faulted caprock thickness and fractal dimensions，it is considered that the source fault activity rate during accumulation stages controls the capacity of vertical hydrocarbon migration，and the hydrocarbon vertical migration along source fault is more likely to happen when fault activity rate is more than15 m/Ma. The faulted caprock thickness controls hydrocarbon vertical distribution，and the caprock is difficult to impede the migration of oil when the faulted caprock thickness is less than 60 m. The fault fractal dimensions control the migration and accumulation efficiency of hydrocarbon in shallow reservoirs，and the migration and accumulation efficiency of hydrocarbon is relatively high when the value of fault fractal dimensions is higher than 1.30. Aa a result，the quantitative evaluation method of fault-control hydrocarbon accumulation was established based on three factors including activity rate，faulted caprock and fractal dimension，and the fault control effect on hydrocarbon accumulation in Structure area Bozhong 29 near Huanghekou central structural ridge was evaluated quantitatively and 6 benefit targets were optimized as the next hydrocarbon targets.