To better understand the mechanism of concrete frost damage, the influence of NaCl concentration on the absorbed solution amount of reactive powder concrete was investigated. The difference of absorption characteristic between specimen surface and core were correspondingly compared, the absorption characteristics of specimens after 1000 freeze-thaw cycles were studied, and the capillary absorption coefficients of different areas were calculated. Results show that the absorbed solution amount of reactive powder concrete decreases with the increase of NaCl concentration, and it has a linear relation with the t1／2 during 15～180 min and 180～540 min, respectively. The capillary absorption coefficients of specimen surface are much smaller than that of the core. However, the solution absorption of specimens after 1000 freeze-thaw cycles significantly declines, which is only 0.33 times of that before freeze-thaw cycles. The capillary absorption coefficients of specimens after 1000 freeze-thaw cycles are larger in test area which locate farther from the surface of specimen.