The influences of stress level(0, 03, 05, 07) and replacement ratio(0%, 30%, 50%, 100%) of recycled aggregate on capillary water absorption of recycled aggregate concrete was studied. Based on the unsaturated flow theory and the obtained experimental results, the predicted model of water distribution within concrete considering the influence of stress level and recycled aggregate replacement ratio is established using the Boltzmann variable and the exponential law of hydraulic diffusivity. The results indicate that capillary water absorption mass and sorptivity for recycled aggregate concrete show an increasing trend with the increase of recycled aggregate replacement ratio and stress level. Under a given stress level, the depth of water penetration into concrete increases with increasing recycled aggregate replacement ratio of recycled aggregates.