This study sought to understand the impact of research on the social support needs of main carers of patients with different levels of dementia. It is to explore the characteristics of main carers, the needs of dementia patients and carers. The impact of carers’ social support networks was based on the above research objectives. This study applied the secondary data of 2016 of dementia in one city. It was based on a questionnaire survey and samples were actually registered in this city. Their main carers are taken in order to conduct the analysis of the main carer’s needs & social supports of different levels of people with dementia. we analyzed the five aspects of care services, emotional support, financial support, interpersonal support, and welfare services used for dementia patients. It was to compare the needs of social support of main carers between different levels of dementia patients. The research results are stated as follows: Based on the analysis, we can see that there is a significantly higher support in Hakka carers; The second is that the main carer of with dementia case lost many times. It has a significantly higher proportion of the need for support; The third variable is the main caregivers of dementia with higher ADL disability scores. Moreover, those carers of people with dementia used more social services expressed a significantly higher proportion of support needs. In addition, although those carers of people with dementia expressed that they really obtained more social support, they indicated that they were in higher social support needs. In the regression model, there is not a significant differences between the carers of people with different levels of dementia was found. However, there was a significant difference between the carers of people with different levels of dementia on needs of social supports. Moreover, severe dementia patients also expressed a higher level of social support needs.