Today’s world，has entered the era of rapid development of information，the number of information knowledge growth rate，the need for future learning must be self-directed learning. At present，students learn，passive acceptance or occupy the mainstream，students lack the ability of independent learning，students learn more negative resistance. Project based learning is a way of learning that focuses on cooperation and independent inquiry. Introduce the theory of “understanding first” interdisciplinary project study，the pursuit of understanding the reverse teaching design，not only help to promote students autonomous learning，to achieve mastery through a comprehensive study of knowledge，the deep understanding of the concept and migration，is more advantageous to use the multidisciplinary knowledge to solve the problem of the real situation，and realize the knowledge construction in the problem solving，promote student’s meaningful learning.