In the relay race, athletes must complete the handover bar in the 20-meter handover bar area. After the handover, the athletes must stay on the track of their own team until the handover sticks of each team are completed, otherwise they will be disqualified. If an athlete loses his crutch in the relay race, only he can pick it up again. But it can't interfere with other athletes' competitions. It is very important to determine the relay sequence and win the relay race. In the four-person relay race, the two strongest people should be arranged at the starting point and the finishing point, and the first runner is responsible for opening the gap and making a good start. The last runner is responsible for catching up with the sprint and has a good ending.