Mathematics practice is a diverse and colorful learning activity that teachers combine students' experience and knowledge background about mathematics life and guide students to carry out in the form of independent exploration and cooperation and exchange. In a broad sense, practical activities include all operational activities such as hands-on, brain-use, speech and so on carried out by students in the process of understanding the formation of mathematical knowledge and establishing mathematical concepts. In a narrow sense, practical activities refer to "small topics", which are relatively large comprehensive questions for students and have certain space for exploration and thinking. Small project learning is a kind of research learning, and students have to go through a process of collecting information, processing information and drawing conclusions. In the process of learning, students have certain autonomy, and the choice of strategies from asking questions to solving problems can be decided by students themselves.