Because many places in the Netherlands are lower than sea level, and the country has a long coastline and abundant rainfall, it often suffers from floods. Therefore, the main function of the windmills in the Netherlands was to pump water, but it was also used for drainage. Grinding flour, making paper, pressing oil and other functions. Around 1850, the total number of windmills in the country was about 10,000. With the emergence of new technologies, windmills were gradually eliminated, and now there are only about 1,000 left. Most of them are used as tourist or historical buildings. The current windmill is still a symbol of the Netherlands, recording the history of how the Dutch struggled with the sea and turned the sea into mulberry fields.