For a community, to be ecological is the way forward to sustainability, and the first step is to avoid unnecessary trips for daily activities. Realizing the required service function of a community can provide the directions and contents to the community and the one in charged for improving the convenience of life, while allowing residents to reach those facilities by walking or biking, thus achieving the ecological goal of energy conservation. This study adopts the Delphi technique to screen the most important and basic service items of the service function for the urban and rural eco-communities, which are supposed to be accessible and easily reached. Furthermore, the study utilizes the Analytic Hierarchy Process (AHP) to get different weights of these service items for two kinds of communities. Results show that the facilities of daily life are the most basic and important category of the service function for both kinds of communities; elementary school and senior day care service is the most significant item that urban and rural eco-community must have, respectively.