Substitution Rules
When the match becomes dead ball, the coach and captain may request a timeout or substitution from the referee.
Each timeout shall not exceed 30 seconds.
Each team may request two timeouts in one set.
Each team may make no more than 6 substitutions in one set.
Technical Rules
(I) Serving
The server must toss the ball or withdraw the ball within 5 seconds of the first referee's whistle and hit the ball with one hand or any part of the arm before the ball hits the ground. If the ball hits the ground without touching the server, it is considered a serve attempt. After a serve attempt, the first referee shall promptly whistle to allow another serve. The server must serve the ball within 3 seconds of the second whistle. The server shall not step on the ground outside the court (including the end line) or the serving area when hitting the ball or when jumping to hit the ball. After hitting the ball, the server may step on or land inside the court or outside the serving area. One serve attempt is allowed for each serve.
2. Crossing the net
Players are allowed to cross the net and enter the opponent's space without interfering with the opponent's game. Players are allowed to cross the center line with one or both feet and touch the opponent's court while part of the foot touches the center line or is placed above the center line. Players are not allowed to touch the opponent's court with any other part of their body except their feet. Players can enter the opponent's court after the game is interrupted.
3. Touching the net
The new rules stipulate that touching the net is a foul, but it is not a foul if a player touches the net occasionally without attempting to hit the ball. The so-called non-attempted hitting means that the hitting action and the hitting attempt have been completed. For example, after completing the smash action or the screen smash action, occasionally touching the net is not a foul.
4. Offensive hitting
Offensive hitting refers to all other hitting directly at the opponent except serving and blocking. When the entire ball passes through the vertical plane of the net or touches the opponent's player, the offensive hitting is completed. Front row players can complete offensive hitting on balls at any height, but they must touch the ball in their own court space. Back row players are allowed to complete offensive hits at any height in the back court area, but their feet must not step on or cross the offensive line when jumping, and they can land in the front court area after hitting the ball. If a back row player completes an offensive hit in the front court area, part of the ball must be below the edge of the net when touching the ball.
(V) Blocking
Blocking refers to the action of a player approaching the net and extending his hand above the net to block the opponent's ball.
The blocking action that touches the ball is completed. Only front row players are allowed to complete the block, and back row players are not allowed to complete the block. If a back row player blocks the ball back, it is a foul. If the ball is blocked to the team's court, it is the team's first hit. The front row player's blocking touch is not counted as one of the team's hits, so the team can hit the ball three more times after blocking. When blocking, players can extend their hands or arms over the net, but they must not affect the opponent's hit. The over-the-net block touch should be after the opponent's player completes the offensive hit. In a blocking action, the ball is allowed to touch one or more blocking players quickly and continuously.
(VI) Hitting in the game
The rules stipulate that any part of a player's body is allowed to touch the ball. However, the ball must be hit and cannot be caught or thrown. The ball can rebound in any direction. If a player violates the above rules, he will be judged as holding the ball.
The rules stipulate that the ball must touch different parts of the body at the same time. If the ball touches different parts of the player's body one after another, it is a continuous hit foul. However, in a blocking action, the same player or different players in the same block are allowed to touch the ball continuously in a single action. In the team's first hit, different parts of the player's body are allowed to touch the ball continuously in the same hit. The first hit refers to receiving a serve, receiving an offensive hit, receiving a ball blocked by the team, and receiving a ball blocked by the opponent. In the second and third hits of the team, the ball is not allowed to touch different parts of the body continuously.
