Among unarmed defense techniques, there are two kinds of upper limb protection techniques: blocking and grasping. According to relevant data, the upper limb protection technology in unarmed defense technology includes blocking and grabbing, which comes from "Unarmed Defense and Control: Guidance for Police Practical Skills Training". Unarmed defense and control technology refers to the technology that the police can stop violence, protect their own safety, arrest and control criminal suspects with their bare hands when they can't, inconvenient or have no time to use police equipment and weapons in police activities. Unarmed defense and control is a technology aimed at law enforcement and control.