This article provides an in-depth analysis of the MACD indicator, especially the nature of the DIF divergence value and its application in trading. DIF is an important indicator for measuring short-term price momentum. When combined with the DEA signal line and histogram, it can effectively interpret market trends. The article also discusses the meaning of golden cross and death cross signals, histogram patterns, and divergence phenomena, emphasizing the importance of combining multiple indicators in practical analysis, as well as the limitations of MACD. Overall, mastering DIF and its related signals is key to effectively using MACD.