Support line and pressure line are two important concepts in technical analysis, which represent the important support level when the stock price falls and the important resistance level when it rises. To find these lines, it is necessary to analyze historical price data and find the key points when prices fall or rise. The determination of these points can be based on various methods, such as previous highs and lows, moving averages and transaction-intensive areas.

In the specific analysis, we can use the price data of daily, weekly and monthly lines in different time periods to understand the position of support level and pressure level more comprehensively. Generally speaking, buying near the support line will be supported and it is difficult to continue to fall, while selling resistance will be encountered near the pressure line and it is difficult to continue to rise. If the price effectively breaks through these lines, it may indicate a change in the trend.

For example, suppose that in the recent price fluctuation, a stock will be supported and start to rebound every time it falls near 50 yuan, then the position of 50 yuan can be regarded as the support line of this stock. Similarly, if the stock rises near 60 yuan and starts to pull back, then 60 yuan's position can be regarded as the pressure line of the stock.

In short, the determination of support line and pressure line needs to consider a variety of factors and technical indicators, in order to more accurately judge the trend and future development direction of stock prices.