Learn about the culture and moral of Ping'an buckle: perfection, peace and happiness through the virtual simulation course of use of jade carving tools. Master the production process of safety buckle: grind the irregular material into a flat cylinder. Key point: the circle should be regular. Secondly, draw a smaller circle on the front and back sides of the circle, draw the middle line on the side, draw equidistant lines on both sides of the middle line, draw 24 equidistant points on the outermost circle, and also draw 24 points on the small circle of the inner circle, staggered one point, and connect all points according to the same radian. Finally, use the jade grinding tool to separate the 24 lines, make them deep, make rules, follow the work, and punch the middle hole.