The concentration profiles in an inclined continuous thickener were theoretically analyzed by use of vertical and inclined solid flux curves, which were obtained from vertical and inclined batch settling experiments with different calcium carbonates slurries. The theoretical analysis was developed for inclined continuous thickener at a critical-loaded operation and in two typical underloaded operations. The concentration profiles predicted by this analysis agreed with experimental results obtained using the calcium carbonate slurries. Consequently, the settling in an inclined continuous thickener of angle of inclination theta and distance between inclined side plates B can be explained by the model proposed in this study, in which a wedge-shaped layer of clear liquid develops at the upper surface of the inclined plate. The concentration profiles for a thickener of any arbitrary vertical height can be determined graphically.