As the construction of the Guangdong-Hong Kong-Macao Greater Bay Area promotes，the question of how to speed up the collaboration between Hong Kong，Macao and Guangdong （Mainland China） in the field of social welfare systems has become an increasingly important practical policy issue. In order to achieve the coordination of the social welfare systems in Guangdong，Hong Kong，and Macau，we should grasp their basic principles，implementation paths，and key contents. Also，we should establish a social policy consultation mechanism，promote the construction of social policy informatization，establish a social welfare policy research alliance，a Greater Bay Area community and a service trading center to carry out trials in the community service demonstration area. In addition，to achieve the coordination of the social welfare system in the Guangdong-Hong Kong-Macao Greater Bay Area，we should incorporate the “Social China” governance concept，and promote a unified citizenship welfare system by changing the localized and fragmented welfare area structure of the Greater Bay Area social policy.