The rapid development of network technology, human-computer interaction and artificial intelligence has given birth to the metaverse and further promoted the digital transformation of all aspects of people's material life. 2021 is the first year of the metaverse, as a new concept, the metaverse has attracted extensive attention from the industry, academia, media and the public. This paper attempts to deeply analyze the metaverse from the perspective of technology and application. First, the concept and connotation of the metaverse are discussed from the definition, origin and development, characteristics and key technologies (network and computing technology, Internet of Things technology, human-computer interaction technology, electronic game technology, block chain technology, digital twin technology and other technologies); Then, the enterprises and application examples of the current layout of the metaverse are discussed; Finally, the existing problems and opportunities in the development of the metaverse are analyzed, and the future research and application are prospected. Through the induction and analysis of the current development status and research trend of the metaverse and the scientific evaluation of the landing application of the metaverse, we can provide a useful reference for the researchers of the metaverse.