Archaeological Obseration of the Relation between Zhengzhou Shang City and Yanshi Shang City

According to the archaeological investigation and the regulation of the unearthed materials of the outer wall of Zhengzhou city of Shang dynasity,it may be determined that the building time of Zhengzhou Shang city was earlier than that of Yanshi Shang city.In the period of Erligang Culture,Zhengzhou was the Bo capital of Emperior Tang,then it was the center of politics and economy,while Yangshi was a quite larger military post for Shang nalionality to suppress Xia nationality.