期货或期权市场里，当前还没有被平仓或交割的合约总数，也就是"还开着的赌注"有多少张。The total number of futures or options contracts that are currently open — neither closed out nor settled — at any given moment.
持仓量反映的是真实资金的参与深度：OI 上升说明有新资金进场开仓，市场分歧在扩大；OI 下降说明合约在被平掉，参与者在离场。配合价格一起看，能帮你判断一波行情背后是新钱推动还是旧仓在消化。Open interest shows how much real money is committed to the market at any moment. Rising OI means new positions are being opened — more participants are taking sides. Falling OI means contracts are being closed — money is leaving. Watching OI alongside price can reveal whether a price move is backed by fresh conviction or is simply existing positions unwinding.