At present, China has entered the stage of in-depth aging, and the demand for elderly care services shows new characteristic. Nanjing, as the capital city of Jiangsu province which is a developed coastal province in China, is of most typical significance for the study of demand for elderly care services. Based on the statistics of the elderly population in Nanjing, the elderly service demand of the elderly population in Nanjing has been analyzed carefully from the macro and micro levels. In addition, based on the sampling survey of the elderly population in Nanjing, the current situation of the elderly service demand has further investigated and a constructing direction of new type of elderly service system has been proposed. The analysis results indicate that the construction of the elderly service system should be expanded from the original basic security to all the old people, especially for the elderly who are living alone, oldest and disabled. The service level should be changed from the generally low-level service to the higher-level service. And the elderly care model should be changed from "mainly family care" to "equal attention to the family care and institution care". In this way, all kinds of elderly care requirements can be well satisfied. And the elderly of different groups in urban and rural areas, who need elderly care services, can have dignity, choice and affordability. Finally, they can have a happy life.