In the study of high school mathematics, solid geometry is a brand-new content, so it is very important to set up solid geometry. The teaching goal of the first lesson of solid geometry is to make students have a macroscopic understanding of solid geometry and a preliminary overall grasp, so that students can initially make clear the thinking method, main contents and value of solid geometry research, arouse their curiosity and stimulate their interest in learning solid geometry. The teaching objectives of the first lesson are as follows: 1. Teaching objectives 1. Knowledge and Skills (1) Through physical operation and computer software, a large number of spatial graphics are observed, which enhances students' intuitive perception. (2) Space objects can be classified according to their geometric characteristics. (3) Summarize the structural features of prism, pyramid, cylinder, cone, frustum, frustum and sphere in language. (4) The classification of geometry, column, cone and platform will be indicated. 2. Process and Method (1) allows students to intuitively feel the space objects, and summarize the geometric structure characteristics of cylinders, cones, platforms and spheres from the objects. (2) Let students observe, discuss, summarize and summarize what they have learned. 3. Emotional attitude and values (1) make students feel that space geometry exists around real life, enhance their learning enthusiasm and improve their observation ability. (2) Cultivate students' spatial imagination and abstract tolerance.