Abstract: In the laboratory, we observed seed morphology and germination of ten species from Picea genus, and explored the relationships between these seed parameters and geo-climatic factors. Our results indicated that: ① seed length and width, and seed mass of 1 000 grains were very significantly differed among ten tree species in Picea genus; ② seed germination rate, germination start time and germination duration also had significant differences whereas germination peak had no differences among these ten tree species. In addition, the correlation analysis showed: ① seed length was significantly and positively correlated with seed width, and they all were also significantly and positively correlated with seed mass per 1 000, furthermore, the seed mass per 1 000 had significant positive relationships with germination rate, germination start time and duration; ② latitude exhibited significantly and positively relations to seed length and width, and seed mass per 1 000, whereas mean annual temperature showed significantly and negatively relationship with seed length and width, seed mass per 1 000 and seed duration. Therefore, latitude and temperature were primary factors affecting the variation in seed size among ten tree species in Picea genus.