In order to investigate the processes of flower bud initiation, differentiation and stages of morphological development microscopically in apricot, an experiment was conducted in Sahand Horticultural Researches Station, in 1997 Starting early August, samples of flower buds on spur of cv. Shastemy-e-yek were taken every 10 days and after removing the scales under binoculars and fixing the buds in the F.A.A. solution, microscopic slides were prepared after washing, dehydration, paraffin infiltration, and embedding of the samples and after staining them the preparations were studied. The results revealed that the onset of organogenesis i.e. flattening of meristem took place early to mid August. The subsequent organogenesis such as sepal primordia formation occurred mid till the end of August, petal primordia from late August till early September, and stamen primordia from early till the mid September respectively. Pistill development began in synchrony with development of flower organs and it developed within several weeks. Hence, primordia of all flower organs developed early in November.