The scattering phenomenon has an important influence on the reconstructed image in Cone Beam CT (CBCT) imaging systems, and is a long-lasting research topic on CBCT. Focusing on the scatter artifacts in the cone beam CT system, we proposed a powerful scatter correction method using a scatter detecting blocker (SDB) between the X - ray source and the tested object, and then educed the scatter correction algorithm based on the Beer theorem. The result shows that our proposed method can effectively reduce the scatter artifacts and increase the quality of the reconstructed slice image. Our approach reduce the magnitude of cupping from 42.3% to 1.3% and increase the CNR from1.75 to 2.35. This method is computationally efficient, easy to implement, and provides scatter correction using a single scan acquisition without the loss of real-time imaging capabilities.