This book focuses on the two cores of black horse stock selection and wave operation. It combines Dow theory and wave theory, and uses a large number of maps to explain the basic principles of market fluctuations. It also specifies the rules and characteristics of black horse stocks, and introduces "e;black horse line"e;, K-line chart, MACD indicator, volume and price patterns of four band operation methods, aiming to cultivate good investment habits of investors, and ultimately achieve stable profitability