Abstract: ‘Yayou 8’is a new cultivar of Carya cathayensis which was selected from wild resources of Carya cathayensis in Jiande，Zhejiang Province. Compared to other cultivar of Carya cathayensis，the fruit of‘Yayou 8’was larger. The average weight was 5.72 g. The average fruit height was 25.19 mm. The average width of nut was 22.25 mm. And the fruit shape index was 1.13. The kernel accounted for 44.8% in whole fruit of‘Yayou 8’. The fat content of nutlets was 61.10%；the protein content was 65.30 mg · g-1；the potassium content was 2 820.2 μg · g-1，the calcium content was 1 275.7 μg · g-1. The average single fruit production of seven-year-old trees of‘Yayou 8’was 1 291.65 kg · hm-2. In a word，‘Yayou 8’has the good properties of early bearing，high yield，and excellent comprehensive characteristics.

Key words: Carya cathayensis, cultivar