China-US Million Book Digital Library Project, also called CADAL, is a cooperated mass digitization project of universities and institutes in China and USA. The CADAL Project has scanned 1.43 million books and other items, mainly from the collections of 16 well-known academic libraries in China, funded by the Ministry of Education of China (MOE). Zhejiang University Libraries has organized and led the digitization process. This presentation reveals the progress in and issues of the mass digitization project, such as the content selection, technology for scanning, OCR, metadata, copyright and access to the digital products.