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Thermal-hydraulics aspect is one of the crucial aspects that must be considered when reactor design and operation analysis were performed, because this aspect involves security, safety, and efficiency factor that must have to be examined. In this study, thermal-hydraulics aspect of the HTR-10MW and PR-3000MW (which classified into Pebble-Bed Reactor or PBR) were analyzed by reviewing the effect of wall effect using the PEBBLE program, this program using finite-difference numerical method for solving the differential equation of the system. For wall effect, three porosity distribution models are performed to the calculation. From the result of wall effect in HTR-10MW and PR-3000MW, the distribution of porosity from three different models can lead the wall-channeling which can influencing the coolant mass flow profile, both reactor core has different size which induced different respond wall effect. The study concludes that wall effect can induce the thermal-hydraulics aspect of PBR core which is so important to be understanding more the safety ability of PBR core.