"Li Yun Loose-leaf: Mathematics (the second volume of Grade 7)" not only highlights the key points, but also closely follows the content of the textbook, guiding students in the correct learning direction and taking fewer detours, so as to achieve the goal of getting twice the result with half the effort. In the process of writing and teaching, this set of test papers has been strongly supported by teachers, students and teaching and research personnel, and valuable opinions have been put forward to make it more perfect. Here, I would like to express my heartfelt thanks to them and look forward to more people of insight engaged in education to help!