 In 1995, a joint Sino-USA archaeology team including archaeologists from the Archeology Research Institute of Shandong University and American archaeologists under the leadership of Professor Fang Hui investigated the two archaeological sites 20 km to the northeast of Rizhao, and discovered the remnants of a variety of alcoholic beverages including grape wine, rice wine, mead, and several mixed beverages of these wines.Out of more than two hundred ceramic pots discovered at the sites, seven were specifically used for grape wine.Remnants of grape seeds were also discovered.