Due to the extremely low permeability and underdeveloped porosity in tight oil and gas reservoirs, efficient development of tight oil reservoirs typically requires hydraulic fracturing to establish industrial productivity. Pressurized imbibition processes, induced by pressure differentials and capillary forces, persistently occur within the matrix and fractures, playing a pivotal role in oil-water displacement. In this study, using the real matrix of tight reservoir and fractured core samples, CT online scanning pressure imbibition experiment was carried out. By observing the pressure imbibition behavior of matrix and fractured core in real time, the pressure imbibition distance of two kinds of core is determined, and the difference of recovery efficiency under different conditions is revealed. In the part of numerical simulation, a one-dimensional mathematical model considering capillary force and osmotic pressure is used to fit the recovery rate and imbibition distance of tight core, and determine the best closed imbibition time under reservoir conditions. This provides a specific time reference for engineering decision-making, which is conducive to improving production efficiency and optimizing reservoir development strategy.