> For the complete documentation index, see [llms.txt](https://support.backpack.exchange/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.backpack.exchange/support-docs/cn/jiao-yi-suo/jiao-yi/ding-dan-lei-xing/shi-jia-dan.md).
# 市价单
**市价单** 是一种按照订单簿中当前最佳可用价格立即买入或卖出的指令。
### 何时使用？
* 当你希望订单能**即时成交**时。
* 适合快速进入或退出仓位，即使价格有轻微波动也能执行。
***
### 关键点
* **成交有保障**，但价格可能会因市场流动性影响而有轻微差异（滑点）。
* 更适合**紧急交易**，而不是需要精准控制价格的情况。
***
### 如何降低使用市价单时的滑点风险？
1. 在 **合约下单页面** 选择您想交易的代币。
2. 确认交易方向后，选择 **市价单（Market Order）**。
3. 输入订单数量。
4. 点击 **最大滑点设置（Max Slippage Setting）**，输入您可以接受的最大滑点范围。
* 点击 **提交（Submit）** 以保存设置。
* 确认订单。
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