The experiment was carried out at Jableh region during 2012-2013 in two green houses to study the effects of using the bumble bees and organic carbon to improve flower set and yield of tomato hybrid Dalloula . The experiment included three treatments : natural pollination (control) ,flowers pollination by organic carbon, and flowers pollination by bumble bees . The first and second treatments were applied in the first green house , and the third treatment was applied in the second green house . Results showed that the bumble bees treatment produced significantly the highest percentage of flower set and yield than the other treatments . Flower set of tomato over 10 clusters was 89.8% , 83.7% , 39.2% for bumble bees treatment, organic carbon treatment, and control , respectively. The highest yield (22 kg/m2)was obtained from bumble bees treatment . Flowers pollinated by bumble bees gave fruits that looked better in shape , size and color ,and with higher weights . In the bumble bee pollinated flowers , the quality of fruits was superior for vitamin C , sugar and acidity .