什么是定投（DCA）？
DCA是定期投资固定金额的策略。价格下跌时买更多，上涨时买更少。
DCA消除了择时的困扰，降低波动性对平均入场价的影响。
DCA is the single most recommended strategy for new crypto investors. Even professional traders use DCA to build large positions over weeks or months.
DCA Formula
The core DCA calculation:
Avg Cost = Total Invested ÷ Total Units Acquired
Units per period = Investment Amount ÷ Price at that period. P/L = (Current Price − Avg Cost) × Total Units.
DCA vs Lump Sum
In a perfectly rising market, lump sum wins because money is invested immediately. But in volatile, uncertain markets — which crypto always is — DCA usually produces better risk-adjusted returns.
| Factor | DCA | 一次性 |
|---|---|---|
| Timing risk | Low — spread across periods | High — all at one price |
| Emotional stress | Low — automated, no FOMO | High — fear of bad entry |
| Best in bear market? | ✅ Yes — buys more at lower prices | ❌ No — full exposure to drop |
| Best in bull market? | Average — misses some upside | ✅ Yes — full exposure to rally |
Crypto DCA Strategies
The best DCA frequency depends on the asset and your budget. Here are recommended approaches for popular cryptocurrencies:
| Asset | Recommended Frequency | Notes |
|---|---|---|
| BTC | 每周 | Most proven. Weekly DCA over 4+ years has never lost money. |
| ETH | 每月 | Strong fundamentals. Monthly works well for mid-term holdings. |
| SOL | 每两周 | Higher volatility. Bi-weekly captures more price swings. |
| Stablecoin Yield | 每月 | Monthly into DeFi protocols for steady yield. |
Common DCA Mistakes
Stopping during crashes
Crashes are when DCA works best — you're buying at discounted prices. Pausing defeats the entire strategy.
Crashes are when DCA works best — you're buying at discounted prices. Pausing defeats the entire strategy.
DCA into dying projects
DCA only works with fundamentally sound assets. Averaging down on a coin going to zero is just losing money slower.
DCA only works with fundamentally sound assets. Averaging down on a coin going to zero is just losing money slower.
Ignoring fees
Small transaction fees add up over hundreds of purchases. Use exchanges with low or zero trading fees for DCA.
Small transaction fees add up over hundreds of purchases. Use exchanges with low or zero trading fees for DCA.