In order to select the varieties with high and stable yield and widespread adaptability, and to evaluate the testing sites accurately and effectively, GGE - biplot method was adopted to analyze the data from the 8th national regional trials for common buckwheat. The results showed that Dingqiao 1, Heixiaoqiao and Yuqiao - 5 were the varieties with high and stable yield; Yu 9002 and Xinong 9976, both of which were from Yulin, Shaanxi Province, were similar with each other due to their geographical kinship relationship. The testing sites were divided into three groups, and there were similar test environments in two of them. Dingqiao 1 in all sites showed a universal adaptability, while Yuqiao - 5, Xing-tian 1, Weitian 02 - 198 and Heixiaoqiao possessed special adaptabilities and could only be extended in some areas. GGE - biplot analysis could not only help to select the varieties with high and stable yield, but also show the similarity a-mong different varieties, so it was available for selecting or discarding similar test environments.%为了更准确有效地筛选高产、稳产、适应性强的品种和对试验地点的评价,采用GGE双标图对国家区域试验中第八轮甜荞区域试验数据进行分析.结果显示:定荞1号、黑小荞、榆荞-5为产量高、稳定性好的品种；甜荞品种榆9002和西农9976较相似,均来自于陕西榆林,具有地理上的亲缘关系；试验地点相对集中分为三组,第二组和第三组中有相似的试点；定荞1号处于所有试点之中,具有普遍适应性,而榆荞-5、兴甜1号、威甜02-198和黑小荞具有特殊的适应性,在局部地区有推广价值.利用GGE双标图准确筛选出优良品种,同时显示了品种间的相似程度；根据GGE双标图可对试点,尤其是相似试点进行选择和取舍.
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