Eleven copper alloy and two iron artifacts,dating from the Warring States period to West Han Dynasty,and unearthed from Chenggong Tianzimiao and Chenggong Shibeicun,Kunming,were analyzed by optical and scanning electron microscopy.Copper and Cu-Sn alloy were identified,and the chemical composition was similar for similar objects.The copper-made farm implements,weapons and tools were made by casting and showed no sign of usage.Two iron blade swords with bronze handles had been made of hypoeutectoid steel,which was a good quality for weapons.