A Comparative Study On The Effects Of The Four People 's Volleyball Teams In The 17th World Women' S Volleyball Championship

With the continuous development of volleyball, national team generally choose tall athletes, making the fierce of net competition increasingly, defending the weak and strong attackproblems become more prominent.To improve the level of competition and ornamental, attract more people to pay attention to or participate in the volleyball movement, so as to promote the popularity of Volleyball in the world, the FIVB began formal implementation of a series of new rules in the game, including the game set up free defender.Women’s world Championship of Volleyball as one of the three major volleyball tournament, is the highest level on behalf of a single event, always by the national volleyball team’s attention.This research was carried out by methods of literature reviews video observation、mathematical statistics method、expert interview and logical analysis of the 17th the world Women’s Volleyball Championship semi-finals of the effects of libero player in the "Four Attack" system were statistical analysis to identify Chinese women’s volleyball team strengths and weaknesses in the use of technology on the libero player, come to the following conclusions:1 This women’s volleyball world championships in 170-180cm tall among libero player accounted for a large proportion; quitele index was average 374.8; the libero player age span greater and the participate in official games played quite different; Chinese women’s volleyball libero player other international teams were relatively young people.2 The liberos of semi-finals serve quality in first attack system from high to low is:Monica De Gennaro, Camila Brait, Kayla Banwarth, Danna Shan, Zhan Chen.The receiving ball number accounted for the proportion of the team total number from high to low is Kayla Banwarth, Monica De Gennaro, Camila Brait, Danna Shan and Zhan Chen.Opponents power jump serve is one of the main factors restricting of China’s women volleyball team of libero’s relatively weak in receive. There is no significant difference in the service between the Danna Shan and Zhan Chen and the other liberos.3 The libero of semi-finals pick up opponent spike or dink spike quality in counterattack prevention system from high to low is:Camila Brait, Kayla Banwarth, Monica De Gennaro, Danna Shan, Zhan Chen.The libero of Chinese women’s volleyball is the lowest rate in place of counterattack prevention system, the front block team offense and defense conversion is not timely, a lot of pressure to the back of the defense is one of the reasons for the libero people in place rate is low. Libero of semi-finals defend was significantly weaker than the effect of the return of serve, the ball court of libero less than normal proportion. There is no significant difference between the defense rate of Zhan Chen and Danna Shan and other liberos.4 The libero of semi-finals pick up the other side of the block quality in conservative system from high to low is:Camila Brait, Monica De Gennaro, Kayla Banwarth, Zhan Chen, Danna Shan.The reason of influence China women’s volleyball pick up the block badly is mainly affected by counterattack prevention system quality is not high, the organization adjustment attack is to see through each other,the block and defensive pressure increasingly.5 The libero of semi-finals pick up the push of the ball in place rate was 100%, only the Brazil team Camilla and Chinese team Zhan Chen. Liberos were responsible for the main task of pick up ball.6 The libero of semi-finals success rate from high to low is Kayla Banwarth, Camila Brait, Monica De Gennaro, Zhan Chen, Danna Shan. The total number of pad adjustment from high to low is Monica De Gennaro, Kayla Banwarth, Danna Shan, Zhan Chen, Camila Brait.