Red globe grape was used as material, the process of flower bud differentiation was observed with the paraffin section method. The results indicated that the period for the main flower bud differentiation of winter buds of red globe grape can be divided into four stages: the Nondifferentiation (before June 3rd), Inflorescence perimordium differentiation (June 3rd to July 8th), Spikelet perimordium differentiation (Ju...