Combined with the knowledge learned, this paper analyzes how to protect ancient buildings.

To protect ancient buildings, we must first do a good job in urban planning. If there are mistakes in urban planning, it will cause immeasurable losses to ancient buildings. In the process of rapid economic development, urban modernization and township urbanization, large-scale ancient buildings all over the country have been seriously damaged. According to the data, the protection status of ancient buildings in Beijing, Shanghai, Shenyang, Nanjing, Hangzhou, Luoyang, Changsha and other cities is really worrying. Many ancient buildings that should have been saved and protected were destroyed in the wave of urban modernization. How to strengthen the protection of ancient buildings with the development of the city has become an important issue that needs serious consideration and urgent solution. In this regard, Italy's approach is to "abandon the ancient city and build a new city", which is worth learning. In Lyon, France, the Gu Xiang district of1216th century buildings has been well preserved, and there are 250 protected buildings in the district. /kloc-buildings built after the 0/9th century are also in harmony with ancient buildings in style. At home, there are also many examples worth learning. For example, when Ningbo carries out urban greening construction in Yuehu area, there is a dispute about whether to completely demolish the original old houses. As a result of in-depth investigation, several ancient buildings with great historical and artistic value were found, such as the ruins of the North Korean Embassy in the Northern Song Dynasty. If people didn't make an in-depth investigation at that time, the praise was only temporary, but the regret was forever. Another example is the Qinghefang historic block protection project launched in Hangzhou in recent years, which was saved only after the municipal government made up its mind to adjust the planning and cancel the real estate development project. As the saying goes, "He who unties the bell must tie it". Protecting the city's history and culture is related to all aspects of society, but the primary responsibility lies with the government. In the process of urban development, all municipal governments should protect ancient buildings.

Construction is the first priority.

2.2 Improve the scientific and technological content

Protecting ancient buildings means protecting the original state of ancient buildings and the national traditional culture of China. It is very important to fully realize its particularity in the restoration of ancient buildings and ensure that the historicity, tangibility and invisibility of ancient buildings will not be changed in the process of protection and restoration. Every intervention and restoration of ancient buildings requires correct theoretical guidance, based on comprehensive historical materials and archaeological research, investigation, survey, recording and analysis, as well as related multidisciplinary cooperation. Through the comprehensive research and mutual cooperation of various disciplines, it is helpful to achieve a scientific understanding of the protection of ancient buildings by using the knowledge of various disciplines. In the process of restoring ancient buildings, when traditional technology can't solve the problem, any modern technology can be used. Compared with traditional technology, modern science and technology can understand ancient buildings more comprehensively, deeply and accurately, and the protection measures taken are more targeted and scientific. For example, with the rapid development of computer and related technologies, digital protection and restoration based on digital close-range photogrammetry, three-dimensional laser scanning measurement and virtual reality have begun to be used for the protection of ancient buildings and played an important role. Although modern scientific and technological means have the above advantages, they can't replace traditional technology, and even should not be envisaged to be transformed. They should be organically combined, each with its own strengths and emphasis.

2.3 Enhance the awareness of protection

Ancient architecture is an important part of cultural heritage and a non-renewable human resource. Only when citizens consciously join the ranks of protection can ancient buildings last forever. Protecting cultural relics is the common obligation of the whole society and the whole people. The whole country should raise awareness of the protection of ancient buildings, and citizens should also improve their own quality.

3 Conclusion

Ancient architecture is the memory of a city, the witness of its history and the bearing of its cultural accumulation. Once destroyed, the cultural relics themselves and the historical and cultural information they carry will no longer exist. Anyway. Only by protecting and maintaining ancient buildings and keeping them in their original appearance for a long time can they play the role of "physical history book", "historical yearbook" and "cultural carrier" It is our social responsibility and sacred duty to protect ancient buildings, make them last forever, make the past serve the present and serve future generations!