This investigation was carried out in a private vineyard at El-Khatatba region, Minufyia Governorate during both 2005 and 2006 seasons to study the effect of different levels of buds load and fruiting units length on bud behaviour, some vegetative growth measurements and yield of two grapevine cultivars i.e., (Flame seedless and Crimson seedless). Obtained data revealed that a close relationship between pruning severity (number of buds/vine and number of buds/cane) from one hand and most of investigated parameters. However, increasing both buds load/vine and fruiting units length (number of buds per cane) exhibited a higher significant bud burst %, bud fertility %, fruitfulness coefficient number of cluster per vine and yield. On the other hand, increasing bud loads per vine (number of buds/vine) and fruiting units length (number of buds/cane) resulted in decreased all studied vegetative growth measurements (shoot length, shoot diameter, number of leaves/shoot and leaf area) for both "Flame seedless" and "Crimson seedless" grape vine cultivars during the two experimental seasons.