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<p>Parkinson's disease (PD) is a common neurodegenerative disease, characterized by typical motor symptoms and various non-motor symptoms (NMS). Parkinson's disease dementia (PDD) is one common NMS, with high prevalence, disability rate, and poor response to treatment. Recently there have been increasingly new findings in clinical and experimental studies on PDD. This review focuses on its epidemiology, neuropsychological characteristics, predictive factors, diagnosis and pharmacotherapy from clinical perspective so as to promote its research in China.</p><p> </p><p><strong>DOI: </strong>10.3969/j.issn.1672-6731.2017.02.003</p>