A stability analysis was made based on different branch length, tree age and different years in order to improve and perfect the method of the stipule length in peach germplasm resources. A stabilized method of evaluating the stipule length in peach germplasm resources is established. The method is: choose 3 years old trees,outside the crown ,1~1.5m height from the ground, 15~25cm length of young shoot in the middle part of long fruit shoot, measure the stipule length of the grown leaves. We observed and measured the stipule length of 718 Peach Germplasm Resources by this method. We studied the stipule length of Peach Germplasm Resources According to the classification of species and taxons of peaches by SPSS. The stipule length of Peach Germplasm Resources are graded:<0.55cm is extremely short,0.55~0.9cm is short,0.91~1.30cm is Intermediate, 1.30~1.65cm is long,>1.65cm is extremely long. The reference cultivars of stipule length of peaches are ‘Guanghetao2#’,’Honghuabitao’,’New hakuho’,’ saotome’&’ TX4C199’.