Abstract: In view of the current teaching situation of programming course in five-year higher vocational education, this paper explores the effective method to guide students to get started, and puts forward a graphic case teaching method based on turtle library. It gives interesting and useful cases combining graphics and program control structure, graph and data type, graph and modular design, graph and recursive algorithm, graph and computational thinking, etc Students' interest in learning arouses students' curiosity and curiosity, guides students to explore and seek answers actively, so as to construct "three haves" classroom and improve the computational thinking ability of five-year vocational college students.

Key words: Five-year higher vocational education, Turtle library, Case teaching, "Three haves" classroom