The extreme volatility of the cryptocurrency market makes risk management a core element of trading success. Data from 2025 shows that the daily price fluctuation of ETH often reaches 5%-10%, and in extreme cases, even exceeds 30%. In the face of such volatility, professional traders usually adopt the 'position size control' rule: the risk exposure of a single trade should not exceed 1%-2% of the total capital, meaning if a stop-loss point is set at 5%, the maximum position for that trade should be 20%-40%. Another practical tip is 'profit protection stop-loss', where the stop-loss point is moved to the cost price when the position profit reaches 5%; when the profit reaches 10%, the stop-loss point is set at the 5% profit position, which can protect the principal and lock in some profits, avoiding a roller coaster ride. For contract traders, it is essential to avoid the 'margin call' risk, maintaining a margin rate of over 200% to prevent forced liquidation due to extreme price fluctuations.