In 2006 through 2007,Xi’an Municipal Institute of Cultural Heritage Conservation and Archaeology excavated two ancient bridges crossing the old course of Jue River 400m to the west of the southwest cer of the Han Chang’an City.The ancient bridge no.1 was better preserved,of which 160 bridge piles lining in five eastwest rows were excavated;these bridge pries were high and straightly standing,and were almost on their original positions.The alignments and the charting degrees of the bridge pries reflected that this bridge had been burit for twice.Ancient bridge no.2,which was also crossing the same ancient river course,was about 90m to the west of no.1.It was poorly preserved,only the root parts of the wooden bridge pries were found,in total 32 bridge piles in five rows were uncovered.This bridge located about 400m outside the southwest cer of the Han Chang’an City was just between the capital city and Jianzhang Palace of the West Han Dynasty;to its southeast were the sites of the Altars of the Soil and Grains,the Mingtang (Hall of Enlightenment) and Biyong (circular moat surrounding the Mingtang) of the West Han Dynasty and the Nine Temples of Wang Mang’s Xin Dynasty,to its south across the Jue River was the imperial Shanglin Park.The special location of this bridge and the large amounts of building materials of high-ranking architecture unearthed nearby it implied that this bridge would be an imperial court-used bridge on the way from the capital city to Shanglin Park across the Jue River.The discovery of these bridges is significantly meaningful for the researches on the capital planning,traffic and communication and the changes of the water environment nearby Chang’an City of the Han