It is best to look at historical data analysts. Its K-line interface can read 25 years of data, but there is no free version, which can only be used after payment. It is recommended to use the wisdom of the new generation, all free. However, from the perspective of studying stock data, it is enough to have historical data of 10 years, because the trading methods of dealers will change in every era. If you use the disk technology before 65,438+0995,