An understanding of the structure of herbal formulas and the underlying construction principles is essential to prescribing safe and effective herb combinations. For each of the main syndrome groupings, the author discusses the main herb pairs, herb trios, and single herbs that are the foundation for herb formulas which treat that syndrome. All herb names are given in Pinyin, with the pharmaceutical name following the first occurrence. Primary focus is on individual syndromes, including the composition of individualized formulas, though additional sections list other possibilities for herb selection in complicated situations. The principles, methods, and strategies introduced in each chapter are abstracted from a large number of formulas, effectively integrating the knowledge of single herbs, herbal combinations, syndrome differentiations, treatment methods, and treatment sequence. The principal syndromes include exterior, accumulation, internal heat, internal cold, deficiency, dampness, food accumulation, phlegm, qi stagnation, blood stagnation, bleeding, disturbance of heart shen, and internal wind.