什么是滑点？｜DeFi 基础 · Web3Origin 链上学习学院

什么是滑点？What is Slippage?

⏱ 6 分钟6 min

学习目标：学完你能解释滑点是怎么产生的、为什么大额交易滑点更大，并知道交易时如何设置滑点容忍度来保护自己。Learning goal: after this lesson you'll be able to explain how slippage arises, why large trades have bigger slippage, and how to set a slippage tolerance to protect yourself when trading.

大白话In plain words滑点就像去菜市场买菜，你买一斤价格没变，一次买光整摊，摊主就得涨价——买得越多，成交价越偏离你看到的价。Slippage is like shopping at a wet market: buying a pound doesn't move the price, but sweep the whole stall at once and the vendor raises the price — the more you buy, the further your fill price drifts from the price you saw.

滑点（slippage）是指你实际成交的价格和下单时看到的价格之间的差距。在 AMM 里，价格随成交自动变化，所以从你点确认到真正成交，价格可能已经动了。Slippage is the gap between the price you actually get filled at and the price you saw when placing the order. In an AMM the price changes automatically with each trade, so between the moment you tap confirm and the trade actually settling, the price may already have moved.

为什么会有滑点？因为 AMM 用公式定价，你买走的量越大，池子比例变化越大，价格被推得越离谱。大额交易、浅池子，滑点通常越明显。Why does slippage happen? Because an AMM prices by a formula: the larger the amount you take out, the more the pool's ratio shifts and the further the price is pushed. Slippage is usually more obvious with large trades and shallow pools.

交易时你能设置滑点容忍度，比如 1%，意思是：When trading you can set a slippage tolerance, say 1%, which means:

价格在这个范围内偏移，就照常成交If the price drifts within this range, the trade fills as normal
一旦偏移超过这个上限，交易自动失败，保护你不被坑Once the drift exceeds this limit, the trade fails automatically, protecting you from a bad fill

设太低，行情一波动交易就容易失败；设太高，又可能被抢先交易（有人夹在你前后赚差价）薅走更多。理解滑点，你才能在「能成交」和「不吃亏」之间找到平衡。Set it too low and the trade fails easily on the slightest market move; set it too high and you can be front-run (someone sandwiching your trade to profit from the difference) and lose more. Only by understanding slippage can you strike a balance between "getting filled" and "not overpaying".

案例Example你看到某币价格换出来该有 100 个，但因为你这单量大，池子价格被推动，实际只到手 97 个，这 3% 的差距就是滑点。如果你把滑点容忍度设成 1%，这笔交易就会因超限而自动失败。You expect a swap to give you 100 tokens at the shown price, but because your order is large the pool price moves and you actually receive only 97 — that 3% gap is slippage. If you'd set your slippage tolerance to 1%, this trade would fail automatically for exceeding the limit.

配套工具（点开在主站打开）：Related tools (open on the main site):

📝 本节测验📝 Quiz

❓ 常见问题❓ FAQ

滑点和手续费是一回事吗？Are slippage and fees the same thing?

不是。手续费是付给协议或 LP 的固定比例费用;滑点是因价格变动导致的成交偏差。两者都会影响你实际到手多少，要分开看。No. A fee is a fixed-rate charge paid to the protocol or LPs; slippage is the fill deviation caused by price movement. Both affect how much you actually end up with, so consider them separately.

滑点越低越好吗？Is lower slippage always better?

低意味着成交更接近预期价，但设得太低，行情稍波动交易就失败。实际要根据币的波动和交易量在能成交与少吃亏间权衡。Lower means the fill is closer to the expected price, but set it too low and a small market move makes the trade fail. In practice you weigh getting filled against losing less, based on the token's volatility and trade size.

大额换币怎么减少滑点？How do you reduce slippage on a large swap?

可以分成几笔小单、选流动性更深的池子，或避开剧烈波动时段。核心是别让一笔大单把浅池子价格推太远。You can split it into several smaller orders, choose a pool with deeper liquidity, or avoid highly volatile periods. The key is not letting one big order push a shallow pool's price too far.