The sizes and the uniform performances of peanut seeds are the basis of seed cleaning and grading,and the core element of breeding peanut.Three axis dimensions,the average diameter and weight per 100 seeds were selected as indicators.The differences,distribution and interrelation of the three axis dimensions of the seeds,the uniform performance and the relationship between seed sizes and the weights were analyzed with statistics.The results showed that three axis dimensions obeyed the normal distribution with significant differences among different varieties of peanuts.There were linear correlations between three axis dimensions.Differences between seeds of peanut varieties were homogeneity.The geometric mean diameter of peanut seeds,arithmetic mean diameter and the trends of weight changes were basically same.The sizes and the uniform performances were significantly different among peanuts varieties.Many factors should be comprehensively taken into account on cleaning and grading of peanuts seed.