Writing the futures half-hour high and low index requires the following steps: 1. Determine the calculation time period: the half-hour height index refers to the highest price and lowest price within half an hour, so it is necessary to determine the calculation time period as half an hour. 2. Calculate the highest price: within half an hour, the highest price of each tick is the highest price. This calculation can be realized by writing code, or it can be calculated automatically by using tools. 3. Calculate the lowest price: Similarly, within half an hour, the lowest price of every tick is the lowest price. You can also write code or use tools to calculate automatically. 4. Display indicators: display the calculated half-hour high and low indicators on the K-line chart of futures for traders' reference. The specific encoding method varies from code to code, so I won't go into details here. When writing the futures half-hour high and low index, we should pay attention to the choice of time period, the accuracy of calculation method and the intuitive presentation of the index.