“The capillary pressure curve is an important constitutive relationship for simulating unsaturated seepage or water gas multiphase seepage processes in porous media. When the saturation of the wet phase approaches the residual saturation, the corneal and liquid bridge flow formed between solid particles is the main mode of displacement process, and the understanding of how the corneal and liquid bridge control the capillary pressure curve is still insufficient. Build a microfluidic visualization experimental platform and conduct quasi-static drainage experiments in 6 different pore structures and roughness of microfluidics. Through the experiment, observe the corneal fluid bridge flow and quantify the effect of this phenomenon on the capillary pressure curve. The results indicate that corneal fluid bridging mainly occurs at low saturation levels, leading to a decrease in residual saturation of the wet phase by 0.21-0.32; The occurrence of corneal fluid bridging is closely related to the wettability of the pore medium. A rough solid surface reduces the contact angle of the wet phase, making corneal fluid bridging more likely to occur; The effect of corneal fluid bridge is positively correlated with the number of fluid bridges, and the role of corneal fluid bridge flow becomes significant as porosity and heterogeneity decrease. #Template # introduces its research progress in the field of xxx. xx experts have established xx system/explored xx topics/verified xx hypotheses, providing solutions to xx problems/opening up new directions for xx research/laying the foundation for xx system construction. #Rewriting #, new progress has been made in the study of capillary pressure curves. Experts have built a microfluidic visualization experimental platform to explore the influence of corneal fluid bridge flow on the curve, opening up new directions for the study of pore media permeability.”