Parabuia is a willful disorder, mainly manifested by the patient’s intention and behavior contrary to normal people, such as unnecessary or impossible to carry out willful action, but the patient strives to pursue it; on the contrary, a little effort or willingness to achieve, but the patient is suffering, see it as a lot of difficulties, and refuse to enter. The patient’s volitional psychology and behavior are incomprehensible to ordinary people. This is mainly seen in youthful or delusional schizophrenia. Schizophrenia is a serious mental illness that can be extremely damaging to the patient and can lead to many harms. That is why it is important to diagnose schizophrenia correctly. First, based on the medical history information, which is the description of the condition provided by the family, this is the vertical basis for diagnosis. The psychiatric examination that I conduct with the patient yields the horizontal diagnostic basis, and I will analyze the vertical basis as well as the horizontal basis to make a diagnosis that best fits the patient’s current condition. Any factor that affects the completeness and correctness of these two bases can lead to a wrong diagnosis, such as incomplete and non-objective reporting by the family, or concealment of the patient’s condition by the patient himself, or lack of cooperation in the psychiatric examination that does not lead to psychiatric symptoms. The patient’s factors sometimes we can not help, after all, he is a patient does not cooperate, but the family should provide a complete and accurate detailed description of the condition as much as possible, will bring great help to the diagnosis. Secondly, there are times when a correct diagnosis can be made based on medical history information. Of course, it is best to interview the patient to get the most reliable diagnosis. In some cases, even if the patient is interviewed in time, the diagnosis may not be correct due to the complexity of the condition, and the patient needs to be observed for changes in the condition. Finally, mental illness is very complex and the early manifestations are often atypical, and mental disorders in children and adolescents are also atypical. This is all normal. The diagnosis of mental illness is not a simple matter and requires the joint efforts of doctors and family members.