Recently, some friends asked me how to trade perpetual contracts, so I整理ed my understanding in hopes of helping beginners avoid detours.

Speaking of perpetual contracts, this is indeed one of the most common trading tools in the crypto world. Simply put, a perpetual contract is a way to bet on price movements without actually holding the asset. Its English name is Perpetual Futures, abbreviated as PERP, for example, Bitcoin's perpetual contract is called BTC-PERP.

Why do so many people use perpetual contracts? There are mainly a few reasons. First, it allows short selling, meaning even if you don't hold a certain coin, you can bet on its decline. Second, leverage is available, which is the most attractive and also the most dangerous aspect of perpetual contracts. Using 100 dollars with 10x leverage, you can operate a position worth 1,000 dollars. Profits are great when you're right, but losses can come quickly too.

I think the key to understanding perpetual contracts is to clarify a few core concepts. Going long means expecting the price to rise; going short means expecting it to fall. For example, if you buy a long contract with 100 dollars, and the coin rises to 120 dollars at settlement, you earn 20 dollars. The logic for shorting is the same, just in the opposite direction.

Leverage ratio is like a lever in physics—small force can move large weight. 10x leverage means your profits and losses are amplified by 10 times. A 10% increase can yield 100% profit, a 10% decrease can wipe out 100%. It sounds crazy, but some people have become overnight millionaires, while others have gone bankrupt because of it.

The margin mechanism is the lifeline of perpetual contracts. The money you投入 is called the initial margin, which determines how much you can lose at most. Once your losses reach the initial margin, the system will forcibly liquidate your position. For example, if you have 100 dollars with 10x leverage, and the coin drops 10%, you will be liquidated immediately. To avoid forced liquidation, you can add margin, which is called maintaining margin.

Besides trading fees, perpetual contracts have a unique feature called the funding rate. This is a mechanism to adjust the price difference between futures and spot markets. When the funding rate is positive, long traders pay short traders; when negative, the opposite. This rate is settled every 8 hours and is a good indicator of market sentiment.

Another important concept is forced liquidation. If your margin falls below the maintenance margin, the exchange will automatically close your position and charge a fee. To prevent this, you need to close your position proactively before reaching the liquidation price or add margin in time.

Regarding the settlement methods of perpetual contracts, there are mainly two types. USDT-margined contracts are settled in USDT, so you can clearly see your profit and loss. Coin-margined contracts are settled in the underlying coin, such as Bitcoin; if the coin price continues to fall, your gains might be offset. If you want to lock in profits quickly, use USDT-margined contracts; if you're confident in the long-term trend of a coin, use coin-margined contracts.

I must say, the biggest risk of perpetual contracts is liquidation. High leverage amplifies both gains and losses. What's more dangerous is that cryptocurrency prices are highly volatile, often experiencing "pokes"—short-term sharp drops or surges, then returning to the original price. These pokes are the easiest to trigger liquidation, catching traders off guard, sometimes leaving no time to add margin.

My advice is, if you're a beginner, start with small amounts, set stop-loss and take-profit orders. Perpetual contracts can make you profit quickly, but also cause rapid losses. Understanding these mechanisms will help you survive longer in the market.