Thompson Seedless grapevines grown in EL-Korimat region were subjected to three training systems under gable trellising system for two years (2004 and 2005),1- Divided canopy (DC), 2- Head shape (HS) and 3- Four main arms (FMA). All three training systems were cane pruned to 6 canes x 12 buds.  Divided canopy (DC) led to the best growth expressed by weight of cane pruning, trunk and cane thickness and moderate internode length compared to FMA. However, head shape training improved vine growth better than FMA training system. Also, DC training and HS training system gave significant increase in bud burst, fruitful buds and number of clusters per vine compared to FMA training system. Also, clusters number at early stage (30-40 cm of shoot length) was significantly increased compared to FMA training system. Cluster weight was significantly increased in the first season but not in the second one. Berries number per cluster was not affected. Cluster weight was significantly increased in the first season only compared to FMA. Berry weight and size were slightly increased with DC and HS shapes compared to FMA system. Moreover, SSC and sugar content of berry juice were increased with DC and HS training system, while acidity was reduced in the first season only compared to FMA shaping system. These data suggest that vigorous vine growth, high crop loads, better quality of clusters and berries occurred with divided canopy training system (DC)  compared to the other two training methods under study.