Abstract: The genetic diversity and correlations of eleven characters in 102 watermelon germplasm were assessed.The results of genetic diversity showed that: The high genetic diversity were detected on all of the characters in Fruit weitht,Seed per fruit,1000-seed weight,Seed thickness,Seed length,Seed width,Seed ratio,Ground colour of seed, Shape of seed surface, Over colour of seed surface, Smoothness of seed surface. The diversity index ranged from 0.69～2.05, most of Ground colour of seed in tested materials were gray yellow and most of Smoothness of seed surface in tested materials were smoth;The result of Correlation showed that: Fruit weitht was significantly and positively correlated with Seed per fruit Seed length, Fruit weitht and Seed width(?＜0.05). Seed per fruit was significantly and negatively correlated with Seed thickness(?＜0.01). 1000-seed weight was significantly and positively correlated with Seed thickness,Seed length and Seed width(?＜0.05).