The sewage pipe buried projects were executed in many metropolitan areas to improving economic development and people's quality of life. Due to the exiting underground pipelines configuration is very complex, we have to determine the correct position of the sewage pipes laying in advance in order to avoid possible damage of the exiting underground pipelines. This study will delineate the distribution of underground pipes by ground penetrating radar and resistivity surveys in the Bade and Taoyuan districts, and figure out the possible misinterpretation the survey results by referring the actual excavation at these sites by the Taiwan Water Supply Corporation, then with the aid of the map data information provides by the pipeline management units, it will reduce the risk of pipeline damage in road excavation. It also provide an available space to installation a new sewage pipe which can reduce the budget of the construction units.