Hydrothermal venting systems mostly develop on the localized bathymetric highs of mid-ocean ridges with different spreading rates, and porous-elastic thermodynamic numerical models, which is filled with Darcian fluid can intuitively model the geometry, temperature structure and venting location of the hydrothermal systems in oceanic crust. Simulation results and the experimental-analytical model reveal that bathymetric highs with different sizes show a varied influence on the geometry of hydrothermal convection, the greater and wider bathymetric highs, the greater deflection of underlying plume to the bathymetric highs. Adopting the cross-axis bathymetry of the EPR 9°17′N and Lucky Strike hydrothermal fields into the model, our simulations produce vents fitting the realistic location of these two fields well. Finally, our schematic model for bathymetric relief deflecting underlying plumes indicates that the lower bathymetry and its underlying porous oceanic crust act as the main recharge zone, while the bathymetric high focuses the most of the discharge hot fluid due to the reduce of the overlying pressure of seawater.