Baodun City is one of the well-known world heritage sites dating back to 2500BC,located in the fertile Sichuan basin.Around 2300BC,the Baodun city was abandoned and disappeared because of no assure reasons.However,in the year 1995,the lost city of Baodun was fortunately discovered by archaeologists and became the National Protected Heritage Site in the same year.Since then much work such as the field survey and archaeological excavation has been done.Among them,the core and underlying problem is what is the scope of the Baodun city.In the late year of 2011,the archaeologists found some segments of the trace of city walls and demonstrated the possible boundaries.To help archaeologists better understand the possible city boundaries,the high resolution Quickbird imagery was acquired and processed.So this paper focused on the remote sensing detection of the possible city walls to recover the possible evidence of archaeological features.Some methods such as directional edge detection filters were also applied to the Quickbird imagery in order to enhance the cultural features.Then the spatial features were analyzed,which may help archaeologists better understands the structures of the ancient city and the concept behind them.