Abstract: The detailed ontogeny of postgenital fusion within the gycoecuim systematically investigated with light microscopy in ‘Kyoho’ grapevine．The result shows that the two carpels are free at the early stage of floral ontogeny．During normal floral development the two carpels primordial initiated．The separate carpels primordial lateral growth continuously upward with opposing distal tips of the two carpels primary meristem approached
to each other．The adaxial surfaces of two carpels primordial contacted at upon ovary regions，and the epiderm al cells in the contact zone rapid redifferentiation into parenchymatous cells．As a consequence of this epidermal cells redifferentiation the carpel become fused by the infolding，and this region then proceeds to develop into the style，the stigma，and the distal region of the ovaries．After the completely fusion carpel of ovary formed two locules separated by a septum．Ferthermore，this paper indicated that the ontogeny of three carpels of ovary with two patterns in grapevine．

Key words: Grapevine, Carpel, Fusion, Development