Fan, a Shanxi reader, first sounded the salute of the British navy. At that time, British colonies were all over the world. In order to show its powerful strength and position, Britain requires other countries' navies to fire salutes when they enter port or pass through other countries' batteries. It is said that from 1730, the British navy fired a 2 1 salute at the king and queen. 1875, the State Council reached an agreement with the British ambassador to the United States, stipulating that, according to the usual practice, salute should be the most solemn etiquette for welcoming guests, followed by 2 1 and 19. Because even numbers were considered unlucky then. The number of modern firecrackers represents the relationship between the two countries and the degree of respect for each other. The number of salutes depends on the identity of the recipient. The current international practice is: 2 1 ring to greet the head of state or other people at the corresponding level; 19 ring greetings to heads of government or other personnel at the same level; 17 call to greet officials at the level of deputy prime minister. There are also 15 and 13 salutes. But the first two are mainly used, and some countries are not so strict in distinguishing. The firing time is usually when the distinguished guests arrive or leave.