Problems in real life are often comprehensive and open, and often include mathematical knowledge, common sense of life, scientific knowledge and artistic knowledge. Mathematics theme learning is to properly process such a realistic theme, so that it comes from life and is higher than life, which is more conducive to the acquisition of students' knowledge and skills, the cultivation of intellectual ability and the improvement of aesthetic quality. After learning the knowledge of symmetry, the teacher arranged such a series of homework: making axisymmetric patterns with leaves to keep springs; Draw an axisymmetric pattern and mark the names of each part in English; Using the knowledge of axial symmetry, beautiful patterns are cut out. The arrangement of this assignment skillfully combines mathematics, science and technology, English and production, which not only consolidates symmetrical knowledge, but also makes everyone experience the fun, usefulness and fun of mathematics in hands-on.