The upper part of the kick is made of gunpowder. The second kick, the upper part, that is, the explosion part, uses gunpowder to create an explosion effect. Gunpowder is a mixture with extremely fast combustion speed, which is composed of potassium nitrate, carbon, sulfur and other chemicals. After the powder is ignited, the fuel and oxidant in it will react quickly, producing a lot of gas and heat energy, which will burn very fast and produce powerful explosive force and noise. Two-kicking firecrackers, a traditional folk product, are often used in festivals, weddings, memorial ceremonies and other occasions, mainly relying on the principle that the reaction force generated by the bottom gunpowder hitting the ground is pulled off.