In traditional Chinese medicine, classic formulas are the most scientific and the easiest to pass on. The reasons are as follows: First, the effectiveness of classic formulas is prominent. Second, the effectiveness of classic formulas is the easiest to repeat. However, doctors nowadays often neglect the application and effectiveness of classic formulas, and even abandon classic formulas. When applying classic formulas, it is best to have specific education with experience. If one only knows so-called function of the formula, the effectiveness will be compromised. Therefore, it is important to make everyone understand and apply classic formulas to promote Chinese medicine. I divide the application of classic formulas in to the following stages to analyze the tips of applying classic formulas in clinical practice: 1. Syndromes based on formulas; 2. Syndromes based on herbs; 3. The root of the formula; 5. Original formula and modification; 6. Dosage; 7. Effectiveness. Hope to provide different opinions and to share with every doctors.