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<正> In 1999,the Tang Luoyang City Archaeological Team,IA,CASS,discovered andexcavated vestiges of a defensive ditch of the Northern Song period and the remaining city-wall and pro-tecting slope related to them in the old-city area of Luoyang.The excavation covered an area of about 935sq m.The ditch runs in the north-south direction,has an inverted trapezoidal section and contains mainlyalluvial deposits.The protecting slope lies on the western side of the ditch and is built of rammed earth.The city-wall is constructed from the foundation trench surviving from the eastern wall of the East City ofLuoyang.The unearthed objects include pottery,porcelain,coppers and bronzes and iron artifacts,withcopper coins,bronze mirrors and porcelain articles of the Northern Song period as the main part.Theexcavation provided material data for understanding the location of and spatial distance between thecity-wall and the moat in ancient China,as well as the building method and characteristic features of themoat.