The study of this paper aims to the construction of a support system for the risk assessment of dementia by employing of the combination the technologies of neural networks and fuzzy expert systems of artificial intelligence. The neural network is employed to identify the individual weight for the risk factors resulting in dementia. The risk factors with its respective weight are then used to develop the fuzzy expert system for dementia risk assessment. In this study, the system is deployed to the cloud platform so that on mobile devices to provide the use of the publics may use mobile device to conduct a self-assessment of the risk to contract dementia. The proper information and advices of diseases situation is also provided for preventing the dementia or reducing the risk of deterioration.