After the second-level referee arrives at the competition venue, he should check the venue together. Whether the equipment meets the requirements. If necessary, take the initiative to contact the person in charge of the venue, preside over the lottery and admission ceremony before the game, and the preparation time is controlled by the second referee. Before each game, the first referee should give the second referee enough time to check the positions of the players on both sides. In the competition, the first referee focuses on the foul of the server, the attacker, the net edge and the net side, and the second referee focuses on the foul of the receiver, the block and the net edge and the net side.
The suspension and substitution are mainly controlled by the second referee, and the first referee should give him time to complete the substitution procedure. If the substitution is delayed, the second referee will prompt the first referee in time, and the first referee will impose a penalty. When a team is suspended twice and replaced by five players, it is necessary to notify the first referee by gesture. When the second referee finds that the ball touches the goalpost on the same side or crosses the net from the outside of the goalpost, he should whistle in time. If the ball on the same side is found out of bounds and played four times, make a gesture that only the first referee can see in time.
Gestures should be placed on the chest, if the first referee doesn't see them. The second referee should take back his gesture immediately and don't insist on his own judgment. The second referee whistles and gestures at the ball, which is difficult for the first referee to see. After or at the same time as the first referee blows the whistle to serve, the second referee should not blow the whistle to make the first team ask for a timeout or substitution. When the recorder finds that the service order is wrong and the whistle stops the game, the second referee should find out the situation in time and report to the first referee for handling.