Abstract:The aim of the present study was to investigate effect of seed shape and weight on germination and provide a theoretical basis for cost saving of peanut seed selection.With four peanut varieties seeds as materials,a hydroponic experiment was carried out to study the relationship between seed shape, weight and peanut seedling growth The results showed that no significant differences were found between seed germination potentials of four varieties . No difference was observed between germination percentage of Huayu 22 seeds, however, large and medium weights of seeds of the other three varieties reached significant difference or extremely significant level with small type which showed the lowest germination percentage The tendency of water absorption percentage among three weight types from better to less followed the order of small, medium, and large. Both water absorption quantity and water absorption rate among three weight types had similar trend which from better to less was large, medium, and small. The water absorption percentage had a negative correlation with seed weight, seed length, seed width, and seed thickness and had the maximum relational degree with seed width, while the minimum with seed thickness. The quantity and rate of water absorptionhad a positive correlation with seed weight, seed length, seed width, and seed thickness, and the water absorption quantity had the maximum relational degree with seed thickness, followed by seed length, while the water absorption rate had the maximum relational degree with seed length, followed by seed width. In conclusion, based on the needs of actual production and benefit, slender plump seeds with medium weight were the best. This study can provide a theoretical basis for cost saving of peanut seed selection.