This research was carried out on (10) years old ( Golden delicious & Starking delicious ) apple trees . which were planted in AlKafron region – Tartus Governorate under high density system . The research aims to study the effect of severity of dormant pruning on yield of apple trees during (2012-2013) . There were the results were found : 1- There wasn't any effect of pruning treatments on total soluble solids content or total sugars . 2- Pruning treatments were better than control in fruit set in both cultivars , in Golden delicious, were ( 40.75 - 33.20 %) in severe Pruning and control, respectively , in starking delicious , were (31.35 – 26.30 %) in severe Pruning and control, respectively , and Pruning treatments were better than control in average of weight fruit in both cultivars , in Golden delicious, were (140.50-129.30) g in severe Pruning and control, respectively , in starking delicious , were (151.70-139.90) g in severe Pruning and control, respectively . 3- Pruning treatments resulted to reduce total acidity content . 4- Pruning treatments resulted to reduce yield by (14.19-19.72)% in Golden delicious and starking delicious , respectively , comparing with control .