The development of artificial intelligence technology, big data technology, cloud computing and other technologies represented by the United States, Britain and Germany is at the forefront of the world. The policies issued by the government, funds invested, technology R & D and talent training all support the development of intelligent technology. The application and development of intelligent construction abroad are shown in Table 1.

Although China's BIM Technology started late, it has developed rapidly. Since 2012, the Internet of things has been introduced into the construction industry to realize the information interaction between buildings and components, people and things, and things and things. The development of 3D printing technology has a certain practical foundation. In 2013, additive manufacturing was included in the national key support field for the first time, and the research and development of 3D printing software platform was accelerated; The development speed accelerated in 2016 and 2017, and three special policies were issued in 2017 to make up for the unclear 3D printing technology route in recent years. In 2018, the villa in Suzhou Industrial Park was the world's highest 3D printing building in that year. At the same time, intelligent construction will be incorporated into the undergraduate major of ordinary colleges and universities in China for the first time in 2018 to adapt to the new engineering major characterized by "informatization" and "intelligence". It is a necessary professional and technical personnel to promote the construction of intelligent projects in China. In recent years, China's construction industry has also issued policies on artificial intelligence construction, big data and other technologies to vigorously develop information technology. The development of domestic intelligent construction is shown in Table 2.

At present, the technology of foreign developed countries still leads the overall direction. For a long time, China has not invested enough in the R & D of key information and digital technologies, such as basic materials, key components and other technologies, resulting in slow or even out of gear technology research and development; In addition, there is a situation of "emphasizing hardware and neglecting software" in R & D investment, which also leads to the slow improvement of basic software. The United States and a few other countries have strengthened restrictions on the exchange of talents, investment and technology in China's high-tech fields, such as artificial intelligence, robotics and the Internet. Although China's intelligent construction technology has developed rapidly and achieved certain results, there are also contradictions and problems, mainly in five aspects, as shown in Figure 1.