Parkinson’s disease dementia is an undesirable symptom that appears in the middle and late stages of Parkinson’s disease. If Parkinson’s disease patients develop dementia symptoms, they should go to regular hospitals for timely examination and medication under doctor’s guidance, such as vitamin drugs, nutritive brain cell drugs, and cholinesterase inhibitors. When Parkinson’s disease is in the middle or late stage, some patients will develop dementia, and should be under the guidance of specialists for physical examination and symptomatic treatment. Anti-dementia drugs to avoid aggravation of Parkinson’s disease can be applied, including vitamin drugs, nutritive brain cell drugs, cholinesterase inhibitors, such as vitamin B, piracetam, donepezil, memantine and other drugs for treatment. Therefore, when a family member suffers from Parkinson’s disease dementia, it is recommended to go to the hospital in time for examination and treatment according to the results of the examination in order to improve the quality of life of the patient and prolong the life of the patient. The drugs should all be used under the guidance of a doctor.