The upside-down duck head shape is a chart shape in stock technical analysis, which usually appears when the stock price turns from rising to falling. According to the relevant public information of the inquiry, the stock price will rise after the opening, and then start to fall near the highest point, and then rebound before breaking the upward trend line, but the breakthrough fails, and then fall again until the price closes near the lowest point. The appearance of this pattern is usually caused by factors such as market sentiment and investors' trading behavior, and is considered as a sign of the downward trend of stock prices.