Parkinson’s disease dementia is one of the common non-motor symptoms of Parkinson’s disease, and the probability of the disease increases with the prolongation of Parkinson’s disease, i.e., the longer the duration of the disease, the more likely to develop Parkinson’s disease dementia. A foreign study showed that 80% of Parkinson’s patients who survived for 20 years developed dementia. Many patients in the early stages of diagnosis can be found in the cognitive function of the decline, mainly manifested as memory loss, logical thinking ability to decline, many patients are still working will find that the ability to work is not as good as before, in the past easy to remember or solve the problem, and now need to take a pen to write down, etc., may be Parkinson’s disease affects cognitive function. These symptoms are often ignored by patients and their families, especially older patients, memory loss is mostly considered old, confused, is a normal phenomenon, did not pay enough attention, delayed treatment. With the development of the disease, cognitive impairment continues to aggravate, accompanied by a number of psychiatric symptoms, such as behavioral abnormalities, delusions, stirring up family members, and the past is like a different person, etc., is considered to be “abrasive, disturbing”, the family is unbearable to disturb, and only thought of as a pathology and seek medical treatment. Therefore, patients with Parkinson’s disease who have a long history of the disease and cognitive changes should be alerted to the occurrence of Parkinson’s disease dementia. At this time, although the patient’s ability to act under the effect of medicine still exists, and can even live on their own, but the serious cognitive impairment, mental symptoms significantly affect the lives of patients and their families, and ultimately need to have family members with them, can not be independent, and become a burden on the family and society. So how should family members help Parkinsonian dementia patients to improve the quality of life? First of all, diet: patients should continue to follow the principle of avoiding protein diets, that is, avoiding meals when taking medications such as Medopa and Xining, to be one hour before meals or 1.5 hours after meals. Secondly, the daily safety maintenance of dementia patients is also very important: Parkinson’s dementia patients, unlike other dementia patients, due to the difficulty of activity, so their own suddenly out of and lost less. On the contrary, often need to pay attention to the patient hallucinations, delusions and other psychiatric symptoms occur, at this time, patients see in front of the illusion of lifelike, very vivid, so the family’s denial of persuasion are not helpful. If you see the horror and danger of false images, the patient may have a violent tendency for the purpose of defense, then you should go to the hospital as soon as possible to see the doctor, medication adjustment. In addition, Parkinson’s dementia patients often can not take care of their own life, need the assistance of family members, not only because of the difficulty of action, but also the cognitive impairment of the patient, can not take care of their own medication, do not recognize the direction, can not express their own demands, often less speech, difficult to express, and sometimes often meaningless repetition of certain actions, to do some can not be understood strange behavior, and do not know to avoid the danger, and so on. Logical judgment of things is also significantly reduced, and it is easier to be deceived. Therefore, patients with Parkinson’s dementia often need close supervision by family members. If the condition develops further and there are infections, prolonged bed rest, violent tendencies, etc., the patient will need to go to a hospital or a skilled nursing center, apply antipsychotic drugs, and need professional guidance to turn over and sleep on an air mattress bed to prevent bed sores from forming. If the patient is still able to move around to a certain extent, has no violent tendency, and has enough manpower and material resources at home, he/she can be cared for at home, which mainly focuses on preventing the patient from falling down, ensuring the patient to have proper diet and water every day, etc. At the same time, the patient should be encouraged to expand his/her activity range and contact with the outside environment, but should avoid stimuli such as shock, anger, terror, and sadness, etc., which can trigger the patient’s psychiatric symptoms and aggravate the condition. As a family member, we should give the patient enough care and concern, and try to communicate with the patient in various ways, give the patient enough patience and love, try to maintain the patient’s happy state of mind, so that the patient has more access to positive emotions, which in all types of dementia on the patient’s condition is beneficial to the delay, and family members to play a psychological support, family love and care can not be replaced by any drugs.