To collect the ancient prescriptions for the treatment of Bi syndrome in Prescriptions of Traditional Chinese Medicine Dictionary and analyze their characteristics，and to explore basic formulas for the treatment of Bi syndrome and its characteristics of syndrome differentiation of viscera.Methods：Literature research and statistics analysis were conducted to summarize the prescriptions about treating Bi syndrome in Prescriptions of Traditional Chinese Medicine Dictionary，and database of ancient formulas was established.The frequency，distribution and the property，flavor and meridian of the herbals were counted.The regularity of basic formulas for the treatment of Bi syndrome was analyzed and explored.Results：The medicinal property for treating Bi syndrome was given priority to warm drugs.Medicinal flavor were mostly pungent，bitter，sweet.Meridian distribution was mainly for liver，kidney，spleen.Basic formulas of the ancient treatment for Bi syndrome was summarized，and the new idea of treating Bi syndrome from liver and spleen was put forward.