First, the origin and spread of volleyball originated in the United States. 1895 was founded by Sports director william morgan, YMCA of Hollino, Massachusetts, USA. At first, it was a game of slapping basketball on both sides of the tennis net to prevent the ball from falling to the ground. It is called "volleyball", which means "ball flying in the air". At that time, there were no restrictions on the number of people attending the event and the number of shots. With the improvement of technical level, rules are gradually formed. However, volleyball has not been a competition in the United States for a long time, so the technical level of the sport is not improved quickly. 1909 volleyball was introduced to Asia, and it was 16 volleyball. First spread to India, and then spread to China, Japanese, Philippine and other countries. 19 13 held the first far east games, and 16 volleyball was listed as a competition. Later, the volleyball competition in the Far East Games gradually evolved into 12 system and 9-player system. The Far East Games promoted the development and improvement of volleyball in Asia. 19 17 Volleyball was introduced to Europe, which is a six-a-side volleyball. After the end of World War II, volleyball was widely carried out in the former Soviet Union and other eastern European countries, and its technical and tactical level was also high. Volleyball in Africa and Oceania started late and its level was low. Overview of World Volleyball Development According to the history of world volleyball development for nearly a hundred years, it can be divided into two main development stages, namely, self-development stage and promotion and improvement stage. (1) From the appearance of the development stage of volleyball itself to the establishment of the International Volleyball Federation in 1947, volleyball developed mainly in Europe, especially in Eastern European countries and some countries in Asia. Americans invented volleyball, but because it was not included in the competition, it lacked attention. Volleyball in this period has obvious regional characteristics. Asia plays 9-a-side volleyball and Europe plays 6-a-side volleyball. There are no uniform competition rules in the world, and no world-wide competitions are held. It can be seen that in the long 52 years, volleyball has only developed itself in different geographical areas and made slow progress. (II) Promotion and improvement stage After the establishment of the International Volleyball Federation, six-a-side volleyball has been widely promoted all over the world, and its technical level has improved rapidly. Volleyball has become one of the most popular sports in the world today. Firstly, it depends on the relatively stable international peace environment, economic prosperity and scientific and technological progress, which are favorable conditions for the development of various sports undertakings; Secondly, FIVB strives to promote volleyball to the world, and gradually modifies and improves the competition rules, making volleyball a worldwide sports competition. 1 The World Men's Volleyball Championship was held in 1949 and the World Women's Volleyball Championship was held in 1 952. Volleyball has been listed as an official Olympic event since 1964, and the World Cup volleyball tournament has been held since 1965. In addition, the World Youth Volleyball Championships, the World University Games Volleyball Tournament, the World Middle School Volleyball Tournament and various intercontinental competitions, cups and invitational tournaments are also held. Through the world series, the skills, tactics and training level of volleyball have been continuously improved, and the development of volleyball has shown a vibrant situation. According to the laws of volleyball, the situation of great resistance in the world volleyball and the influence of the revision of competition rules, the development trend of volleyball skills and tactics in the world at present is mainly manifested in the following aspects. (1) Comprehensive main offensive and defensive technologies are comprehensive. In the competition, comprehensive skills can not only get the right to serve by scoring directly, but also lose the point to serve directly. Therefore, comprehensive attack and defense technology is the requirement of the development law of volleyball. A high-level volleyball team should be able to buckle and block, attack and defend well, attack quickly and storm strongly, and form a distinctive team and people in an all-round way. In addition, athletes' physical quality, psychological quality, tactical accomplishment and actual combat experience in major competitions should also be comprehensive, and it is difficult for any team or player lacking in any aspect to reach the highest level. (2) Height includes two aspects: one is the athlete's physical strength, and the other is his jumping ability. Height is the key link in online competition. Since 1965 revised the competition rules and allowed people to block the net by hand, the world volleyball team attached great importance to development. At present, the average height of men has reached or even exceeded 1.95m, and that of women has reached or even exceeded1.80m. It is not uncommon for male athletes with a height of more than 2m to take the lead. On the other hand, athletes' jumping ability is constantly improving. Men's run-up touch is above 3.70m, Cuba's main attacker Luis is 1.74 m, and the run-up touch is 3.30m m. At present, there is still a development trend of large athletes. If this goes on, it can be predicted that short athletes will be eliminated gradually, which will become a new topic in the development of volleyball in the world. (3) the combination of height, speed and change in front of the net. The practice in recent years has proved that relying solely on height and strength or relying solely on speed and skill in front of the net can not achieve good results. The Asian team, which is famous for its rapidity and changeability, is actively improving its ability to break through the storm; Strong teams in Europe and America, which are famous for their high scores and strong attacks, are trying to use fast and changeable styles of play. The top teams in Asia, Europe and America all set out from their own reality, integrating height and speed, storms and changes to form their own styles and styles of play. At present, the offensive tactics of world volleyball are developing towards the direction of high acceleration, strong attack and accelerated attack, strength and technology, frontier and depth, and masculine women's volleyball. (4) Serving will be paid more attention. Judging from the current development trend of volleyball, the focus of offensive and defensive confrontation is on the internet. The improvement of individual offensive ability and the diversification of collective tactics have brought more and more difficulties to blocking and back row defense. Therefore, it is an important link to use the service to destroy the opponent's pass, make the opponent's offensive tactics difficult to organize, weaken its offensive strength, and create favorable conditions for its own counterattack. At the same time, serving can also score directly, and aggressive serving can form psychological pressure on opponents, improve their morale and cheer up their spirits. From a team's point of view, the offensive ability of serving has been strengthened, and it can also effectively promote the improvement of its own receiving skills. In addition, after the 24th Olympic Games, the scoring system of the fifth game (deciding game) was formulated in the competition rules, which made serving more important. It can be seen that how to effectively use the service right, especially the fifth game of the deciding game, is a problem that cannot be ignored.

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