In the teaching of tall building structure design for undergraduates of civil engineering, we found that an example about wind load in the textbook does not calculated correctly according to the “Load code for the design of building structures” at that time. When the example was assigned to students as an exercise, most students found the problem and corrected errors. Furthermore, a student put forward a new idea to calculate wind load from the example. It is a typical instance to learn from the students, which shows that teaching benefits teachers as well as students.