This book is a compilation of selected papers from the 2021 China-Europe International Conference on Pipelines and Trenchless Technology. The international academic conference is organized to •             further promote the cause of trenchless works in China •             ensure the quality of engineering construction •             introduce advanced technology, equipment, and materials •             promote the exchange and learning of trenchless technology •             enhance the level of trenchless technology in China •             improve the international influence of trenchless academics in China •             promote the standardization and localization of trenchless technology in China •             and lead the healthy development of the industry..