MACD（平滑異同移動平均線）是Moving Average Convergence Divergence的縮寫。它是由兩條移動均線系統提煉而成，可以用來測量兩條均線之間的距離。 MACD由Gerald Appel開發，在其名為《The Moving Average Convergence Divergence Trading Method》一書中有詳細描述。
MACD 交易信號
MACD主要是用於趨勢交易，不可以用於盤整期。當MACD穿過信號線（9日MACD的指數移動平均數）時，交易信號即產生。
趨勢市場
首先，判定價格走勢是否處於趨勢中：如果MACD指標平直或接近於0軸，那麼說明市場處於調整期，其產生的交易信號不可靠。
• MACD自下而上穿過信號線時，做多。
• MACD自上而下穿過信號線時，做空。
如果出現下面兩種情況，則說明交易信號更加可靠：
• MACD出現背離；
• MACD在0軸附近出現大規模振蕩。
當交易信號產生於0軸上方時，除非出現背離，否則不建議做多；同樣，當交易信號出現在0軸之下的時候，如果沒有背離，則不建議做空。在最近的最低點處或最高點處設置止損。
MACD設置
MACD的默認參數是：
• 慢速移動平均線 - 26 日
• 快速移動平均線 - 12 日
• 信號線 ——快慢移動平均線差值的9日移動平均線。
• 所有的移動平均線都是指數移動平均線。
MACD 計算公式
MACD 指標是通過計算快、慢移動平均線之間的差值得出：
MACD = 12 日EMA— 26 日EMA
信號線的計算方式是MACD的9日EMA。
示例
強生公司股價以及12日 ，26日 EMA。 MACD反映了快、慢EMA的差異。 MACD的9日EMA。
觀察下列地方：
• 當快、慢EMA間距離最大時，MACD距離0軸最遠；
• 當快、慢EMA相交時，MACD則與0軸相交。
• 當市場處於盤整期時，MACD在1.0 和-1.0 之間波動。
MACD Indicator
The MACD indicator is basically a refinement of the two moving averages system and measures the distance between the two moving average lines. MACD is an acronym for Moving Average Convergence Divergence.
MACD was developed by Gerald Appel and is discussed in his book,The Moving Average Convergence Divergence Trading Method.
MACD Trading Signals
The MACD indicator is primarily used to trade trends and should not be used in a ranging market. Signals are taken when MACD crosses its signal line, calculated as a 9 dayexponential moving average of MACD.
Trending Market
First check whether price is trending. If the MACD indicator is flat or stays close to the zero line, the market is ranging and signals are unreliable.
• Go long when MACD crosses its signal line from below.
• Go short when MACD crosses its signal line from above.
Signals are far stronger if there is either:
• a divergence on the MACD indicator; or
• a large swing above or below the zero line.
Unless there is a divergence, do not go long if the signal is above the zero line, nor go short if the signal is below zero. Place stop-losses below the last minor Low when long, or the last minor High when short.
EXAMPLE
Microsoft Corporation chart with: MACD, and MACD signal line.
Go short [S] - MACD crosses to below the signal line after a large swing.
1. Go long [L] when MACD crosses to above the signal line.
2. Strong short signal [S] - the MACD crosses after a large swing and bearish divergence (shown by the trendline).
3. Go long [L]. Flat MACD signals that the market is ranging - we are more likely to be whipsawed in/out of our position.
4. Exit long trade [X] but do not go short - MACD is significantly below the zero line.
5. Re-enter your long trade [L].
MACD Setup
The default settings for the MACD indicator are:
• Slow moving average - 26 days
• Fast moving average - 12 days
• Signal line - 9 day moving average of the difference between fast and slow.
• All moving averages are exponential.
See Indicator Panel for directions on how to set up an indicator. See Edit Indicator Settings to change the settings.
Captions and trendlines: Use MACD Histogram if you want to draw trendlines or place captions on the histogram. Otherwise, they are left "hanging in the air" if you zoom or change time periods.
MACD Formula
The MACD indicator is calculated as the difference between the fast and slow moving averages:
MACD = 12 Day exponential moving average - 26 Day exponential moving average
The signal line is calculated as a 9 day exponential moving average of MACD.
EXAMPLE
Johnson & Johnson with a 12 day , and a 26 day exponential moving average (EMA) plotted on the price chart. MACD reflects the difference between the fast and slow EMA. The signal line is a 9 day EMA of the MACD indicator.
Observe that:
• MACD is furthest from the zero line when the gap between the two EMAs is widest.
• MACD is at zero when the two EMAs cross (the trading signal when using two moving averages).
• MACD fluctuates between 1.0 and -1.0 when the market is ranging.
文章翻譯由兄弟財經提供
文章來源：http://www.incrediblecharts.com/indicators/macd.php