The parting surface refers to the rising and falling areas of stock prices in the capital market, which is called "parting surface". The upper and lower parting surfaces refer to the trend direction of the stock price, that is, upward or downward. When the stock price shows an upward trend, the parting surface is the "upward parting surface", and vice versa is the "downward parting surface."

In the stock market, an upward trend in the parting surface indicates that the stock price is rising or is about to rise; while a downward trend in the parting surface means that the stock price is falling or is about to fall. Investors can predict changes in stock prices by observing the trend of the parting surface and make buying or selling decisions.

Parting surfaces play an important role in technical analysis and can assist investors in stock trading. When the trend of the parting surface is upward, investors can consider buying stocks to obtain profits; when the trend is downward, investors can consider selling stocks to avoid losses. In addition to the stock market, the application scenarios of parting surfaces also include financial fields such as futures and foreign exchange.