Recently, while backtesting trading strategies, I noticed that many people have a somewhat biased understanding of MACD parameters. Everyone knows that 12-26-9 is the default setting, but few truly understand how to adjust them according to their trading style.

Let's first talk about why MACD parameters are so important. Essentially, MACD measures the difference between the fast and slow lines to gauge market momentum. The default 12-26-9 combination is popular because it strikes a balance between sensitivity and stability. EMA(12) captures short-term changes, EMA(26) looks at long-term trends, and EMA(9) serves as the signal line to filter out noise. Sounds good, but the problem is that this set of parameters isn't suitable for everyone.

I've experimented with many combinations myself. For traders who prefer short-term trading, the 5-35-5 setting responds much faster and can catch rising and falling points more quickly. The downside is that it also produces more noise, leading to a higher rate of false signals. Conversely, if you're a swing trader, parameters like 19-39-9 or 24-52-18 can filter out most short-term fluctuations, making signals more reliable. Of course, the trade-off is that signals occur less frequently.

Here's a common trap: overfitting. Some people keep adjusting MACD parameters during backtesting until they fit past market data perfectly. It's like looking at the answer while taking a test—no matter how good the backtest results are, they’re useless because the market won't repeat itself. I've seen too many people suffer losses because they tuned parameters to match historical data perfectly, only to lose money in live trading.

Last year, I backtested Bitcoin's daily data over six months using 12-26-9. There were 7 clear signals, but only 2 of them were valid golden crosses that led to successful rallies. During the same period, using 5-35-5 doubled the number of signals to 13, with 5 being valid. Looks better? Not necessarily. Many of those extra signals resulted in small gains or losses, with limited profit potential. Especially at key points, while 5-35-5 might detect opportunities earlier, it also produces earlier death crosses, which can reduce overall profit compared to 12-26-9.

So my advice is: don't rush to adjust MACD parameters. Beginners should stick with the default 12-26-9 and observe for a while to get a feel for the signal rhythm. Once you truly understand the logic behind this set, then consider fine-tuning based on your trading habits. If you decide to change parameters, make sure to do thorough backtesting, but remember not to overfit. The most important thing is to stick with a set of parameters for the long term; frequent changes will only confuse you more.

Someone asked if it's okay to use multiple MACD parameter sets simultaneously. It’s possible, but that means more signals and increased difficulty in judgment. Unless you're very familiar with this indicator, I wouldn't recommend doing that.

Finally, I want to say that there is no absolute best MACD parameter. The same set can perform very differently across different markets and timeframes. The key is to find the one that fits your trading logic and stick with it, regularly reviewing whether it still suits you. Remember, technical indicators are just auxiliary tools—don't let them become obstacles to your decision-making.