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# 回撤和最大回撤计算

回撤（Drawdown，DD）用于衡量交易账户在特定期间内因亏损交易造成的净值下降幅度，以百分比表示。

最大回撤（Maximum Drawdown，Max DD）表示交易账户在整个存续期间内，从净值最高点下降至最低点的最大幅度。

**计算公式**

DD 根据账户收益率计算。账户收益率则按照该账户两次余额操作之间的期间分别计算。有关详细信息，请参阅**收益率计算**。

假设交易账户在三个期间内计算得出以下收益率：

| 期间       | 收益率    | 最高收益率  |
| -------- | ------ | ------ |
| **期间 1** | 3.6000 | 3.6000 |
| **期间 2** | 1.3636 | 3.6000 |
| **期间 3** | 1.0000 | 3.6000 |

账户存续期间内记录的最高收益率将作为该账户的**最高收益率**。在此示例中，最高收益率为 3.6000。

如果某一期间的收益率等于最高收益率，则该期间的 DD 为 0，表示账户在该期间内没有产生回撤。

如果某一期间的收益率不等于最高收益率，则按照以下公式计算 DD：

`DD = 1 - (1 + Return) / (1 + Maximum return) × 100`

其中：

* **Return** 是账户在两次余额操作之间的某一期间内计算得出的收益率。
* **Maximum return** 是账户在整个存续期间内记录的最高收益率。

在此示例中：

**期间 1**的 DD 为 0。

**期间 2**的 DD 计算如下：

`DD P2 = 1 - (1 + 1.3636) / (1 + 3.6000) = 0.4862 × 100 = 48.62%`

**期间 3**的 DD 计算如下：

`DD P3 = 1 - (1 + 1.0000) / (1 + 3.6000) = 0.5652 × 100 = 56.52%`

账户存续期间内记录的最高 DD 将作为该账户的 Max DD。在此示例中，最大回撤为 56.52%。


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