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Visualization is a kind of technology that data can be converted into images and analysis, used in all kinds of fields. However, in the current research field of spacecraft thermal vacuum test, reading data speed and display image speed are very slow in the process of visualization. Usually the current research field of spacecraft thermal vacuum test through the liquid nitrogen temperature simulated space environment, the use of current generated heat to simulate high temperature environments. And periodically collect temperature, current, voltage, power information, and these were stored in a local database and analyzed for drawing curves. With the passage of time, stored in the local database, increasing the temperature and other data, the curve showing the conventional technique for loading large amounts of data plotted as slow, time-consuming. For this paper, a method of the above problems by optimizing data storage structure to improve the speed of loading information, thereby reducing the need to draw a curve to wait.