William Head Kilpatrick, the founder of project-based learning, advocated that projects are the enthusiastic and purposeful activities in which students engage in a social environment and are designed to enable students to lead productive lives, and develop thinking abilities and moral characters. The types of project-based learning are centered on the material-form projects. As to the implementation of project-based curriculum, it is students who set goals, make plans, execute the plans and judge the implementation process. Kilpatrick's philosophy of project-based learning is of great value in the digital age of 21st century, helping us to get rid of the technicalization and simplification of project-based learning, to make project-based learning a fundamental way of developing core competences, so that students can create themselves by accomplishing various projects.