One of the basic skills of volleyball. The first line of defense is an important means to score points and get the right to serve, and it is also an important link in counterattack. The level of blocking directly affects the result of the game. The net consists of five movements: preparation posture, movement, take-off, air strike and landing. There are single block and collective block. Successful blocking can directly stop the opponent's attack, make us change from passive to active, weaken the opponent's offensive sharpness and pose a greater psychological threat to the opponent.