The Gaogouli was an ancient local regime of the Northeastern China established in 37 B.C.(the West Han Dynasty) and was destroyed in 668 A.D. (Tang Dynasty).The regime lasted more than 700 years. Many vessels, weapons and other categories of bronzes have been excavated and collected. Whether or not the Gaogouli people independently smelted and cast bronze objects is a problem that has puzzled archaeologists and archaeometallurgists. All research on Gaogouli bronzes has focused on archaeological typology, but the technological details contained in these artifacts has not been revealed. This paper describes studies microstructure and technological characteristics of some ancient Gaogouli bronzes using metallographic methods and SEMEDX analysis. The evidence suggests that Gaogouli people could independently smelt copper and cast objects even though no metallurgical ruin has been discovered. The results of the investigation indicate that vessels, axes, mirrors and josses were made of bonze and cast in molds except a brass vessel. Forging was also used to shape copper into desire objects. Some artifacts contain titanium element. These findings provide hints as to the economic development of the Gaogouli people.