Auxiliary tests] The auxiliary tests for Parkinson’s disease include head MRI, head PET-CT, and genetic testing. Through the head MRI test, doctors can generally understand the patient’s intracranial lesions, but for some complex Parkinson’s disease patients need to further PET-CT test, a more accurate understanding of intracranial metabolic level, to identify other neurodegenerative diseases, such as multi-systemic atrophy, progressive supranuclear palsy, dementia with Lewy bodies and so on. In addition, the patient’s cognitive function evaluation, psychometrics, electromyography and other auxiliary tests are also very helpful to the clinician’s diagnosis and treatment.