At 2 a.m., a friend from Zhejiang asked me tremblingly:

“Bro, I went all-in with 10,000 USDT at 30x leverage, and it only dropped 3%—why did I get liquidated?”
I looked at his records, and he had put all 9,500 USDT into the position without setting any stop-loss.
Many people think that going all-in means “holding out,” but in reality, using full position size poorly can lead to quicker ruin than incremental trading.
The key to liquidation often isn’t the leverage level but the size of the position.
Think about it: with a 10,000 USDT account, if you use 9,500 USDT to open a position,
a slight reverse movement can wipe you out completely.
But if you only use 1,000 USDT to open, the price would have to move 50% against you to get liquidated—completely different concepts.
I’ve been using full positions for over half a year without getting liquidated, even doubling my money, by following three principles:
First, never risk more than 20% of total funds on a single trade.
With a 10,000 USDT account, never invest more than 2,000 USDT at once.
Even if I’m wrong and set a 10% stop-loss, I only lose 200 USDT, which doesn’t hurt my overall capital.
Second, never lose more than 3% of the total account on a single trade.
For example, with 2,000 USDT at 10x leverage, I set a stop-loss at 1.5%, which is exactly a 3% loss of total funds.
Even if I make a few wrong calls, the account can still withstand it.
Third, don’t open positions in a choppy market, and don’t add to profits.
I only trade when there’s a clear breakout trend; sideways markets, no matter how tempting, I avoid.
After opening a position, I never add to it just because the price rises—maintaining discipline is most important.
The original purpose of full position sizing is to give you room for error, not to gamble your life on a trade.
A fan once kept getting liquidated every month, but after following these three principles, he turned 5,000 USDT into 8,000 USDT in three months.
He said, “I used to think going all-in was gambling, but now I understand.”
Using full positions correctly is about living more steadily.
In this market, survival is always more important than chasing quick profits.
Less gambling on the direction, more control over position size—slow is fast.