Evidence-based medicine (EBM) is a shift in which medicine from being based on individual experience of doctors to evidence with clear background. In this shift, data mining can play a significant role as its ability of uncovering medical evidence from large volumes of medical data. Recognizing the crucial role of visualization in discovering such evidences, this work presents some developed tools integrated in our data mining system D2MS for appropriately visualizing knowledge, and their usage in hepatitis study. We emphasize on our two rule visualizers, one for individual rule and the other for rule in its relations with the others.