Abstract: The height and basal diameter of Pinus yunnanensis seedlings of 12 provenances, 78 families and the mixed family were measured and analyzed. The results showed that there were significant differences on height and diameter growth among provenances and families. At the provenance level, Shiping provenance of Yunnan was the best, next came Yiliang of Yunnan, Midu of Yunnan, Dechang of Sichuan and Lufeng of Yunnan, whereas the seedling growing performance of Yanbian of Sichuan was the worst. Evaluating at the family level, the families with the best performance in height growth and diameter growth were Longpeng No. 45 and Longpeng No. 52 respectively, all belonging to Shiping provenance of Yunnan. Taken together, there were 17 families with promising performance at seedling stage, they were No. 3, 4, 22, 23, 41, 45, 47, 51, 52, 54, 55, 65, 67, 73, 74, 78 and 80. Moreover, the performance of the mixed family was also good. Conducting cluster analysis based on the height and basal diameter of seedlings belonging to different provenances, 12 tested provenances could be classified into 5 groups, Shiping of Yunnan was preliminarily screened out to be the best provenance, next came to Tengchong of Yunnan, Midu of Yunnan, Dechang of Yunnan, Lufeng of Yunnan, Yiliang of Yunnan.