义务教育数学新课程标准指出,要让学生通过具体的观察、操作、实验、想象、归纳等一系列探究活动,初步建立空间观念,发展几何直觉。通过小学教学,学生对空间与图形已有初步的认识,但由于受年龄的限制,学生的空间观念、空间想象能力仍然比较薄弱。所以,空间与图形的教学是初中数学的重要内容之一。 The new curricular standard of compulsory education mathematics pointed out: To enable students to initially establish the concept of space and develop geometric intuition through a series of inquiry activities such as observation, operation, experiment, imagination and induction. Through primary school teaching, students have preliminary understanding of space and graphics. However, due to the limitation of age, students’ space concept and space imagination are still relatively weak. Therefore, the teaching of space and graphics is an important part of junior high school mathematics.