Chinese criteria: The 1996 and 2001 Nanjing PVS meetings clarified the diagnostic criteria for vegetative state in China as follows: 1. loss of cognitive function, no conscious activity, and inability to accept instructions; 2. maintenance of voluntary respiration and blood pressure; 3. sleep-wake cycle; 4. inability to understand and express language; 5. ability to open eyes automatically or under stimulation; 6. may have no 6. purposeless eye tracking movement; 7. basic preservation of subthalamic and brainstem functions. Most scholars believe that the diagnosis of PVS is mainly based on clinical manifestations, and objective examinations such as EEG, SEP, BAEP, CT, MRI and SPECT can only be used as auxiliary references. The new concept of “vegetative state” (VS) proposed by the American Multidisciplinary PVS Study Group in 1994 is: “The patient completely loses cognition of himself and his surroundings, has a sleep-wake cycle, and the autonomic functions of the subthalamic and brainstem are completely or partially preserved. partially preserved”. This state can be transient, a stage in the recovery process from acute or chronic severe brain injury, or permanent.VS can also be the result of the progression of some degenerative or metabolic disease or congenital malformation of the nervous system. VS at 1 month after acute traumatic or non-traumatic brain injury can be diagnosed as PVS, while a vegetative state due to degenerative or metabolic diseases or developmental malformations must persist for more than 1 month to be diagnosed as PVS. Japanese criteria: Most Japanese scholars advocate an open-eyed coma state for more than 3 months as the threshold. As can be seen, most countries are in agreement on issues such as signs and symptoms for the diagnosis of vegetative state. On the issue of the time of diagnosis of vegetative state, most countries take the open-eyed coma state of more than one month as the standard. In the author’s opinion, considering the actual situation in China, it is beneficial for the patient to be diagnosed as a vegetative state when the eyes are open and comatose for more than one month, instead of adopting the Japanese standard of three months. In this way, the patient can be reminded to enter into the wake-up treatment procedure of vegetative state as early as possible, instead of being blindly optimistic and missing the best time for wake-up treatment of vegetative state for nothing.