Based on comparison and analysis of the ten strategic technology trends published by Gartner in past five years, ten key technologies that will cause technological change and development in the field of library were chosen and their application in library were analyzed. It is believed that artificial intelligence, virtual and augmented reality, block chain, and twin digital dialogue system will become the main direction of future library technology transformation and development of the digital technology. Digital twin is valuable in the theory and application research in the digital humanities and cultural heritage digitization.