Recently, I've been observing how traders use MACD to catch market trends, and I found that many people's understanding of the DIF line, the fast line, is still a bit vague. In fact, mastering it allows you to quickly judge the short-term momentum of the market.

Let me give an example. During mid-last year, ETHUSDT experienced a strong rally. When the DIF line crossed above the DEA line, Ethereum directly entered a bull market with a significant increase. Conversely, at the end of the year before last, when DIF crossed below to form a death cross, the price retraced over 60%. So if you can timely catch these DIF signals, you can indeed avoid many risks.

MACD essentially is a combination of three components. The fast line, DIF, is the core. It subtracts the 26-period long-term moving average from the 12-period short-term moving average, quickly reflecting the difference between short-term and long-term market momentum. When DIF rises, it indicates increasing short-term strength; when it falls, it indicates weakening. The slow line, DEA, is a smoothed version of DIF, used to filter out noise and provide more stable confirmation signals. The energy histogram is the result of DIF minus DEA; the higher the bar, the stronger the bullish force.

Regarding calculation, MACD is based on the Exponential Moving Average (EMA). Unlike simple moving averages, EMA gives more weight to recent prices, making it more responsive to price changes. DIF is calculated as EMA(12) minus EMA(26). When the short-term EMA is above the long-term EMA, DIF is positive, indicating bullishness; when below, it’s negative, indicating bearishness.

The calculation of DEA is a bit more complex. It is a 9-period exponential average of DIF, calculated as: today’s DEA = DIF * 0.2 + yesterday’s DEA * 0.8. This smoothing makes the line more stable. When DIF crosses above DEA (golden cross), it’s usually a buy signal; when it crosses below (death cross), it’s a sell signal.

When I use MACD myself, I mainly watch the crossover points of DIF and DEA. But note that no indicator guarantees 100% accuracy, and MACD has a lag. It’s best to use it together with other technical indicators. Also, MACD parameters are adjustable. For short-term trading, you might try (5, 13, 5); for longer-term analysis, try (50, 200, 20). Remember to backtest to find the settings that suit you best.

Actually, the DIF line is like a thermometer for the market’s short-term sentiment. Learning to read it can make your reaction to market moves faster. If you're interested in a deeper study, you can open the candlestick chart on Gate and add the MACD indicator to try it yourself—it's faster to understand than just reading articles.