Gemlik olive is the most common olive variety in Turkey. Generally, 30-40 trees are planted per decare and pruned as open vase style. In the modern olive cultivation, harvest and growing process are eased and yield per decare is increased by shortening planting density. For this purpose, it was researched that the effects of different planting densities and pruning styles on fruit set of Gemlik olive in Antalya conditions. One year old Gemlik olive seedlings, which were propagated by cuttings, were planted with 5x5 m, 4x3 m and 4x1.5 m densities and they were pruned as a control (not pruned), open vase and vertical axe styles. Plant height, trunk diameter, and also, beginning dates of inflorescence development, flowering, full flowering, the end of flowering, and the development of green, pink and black fruits, were observed on plants. Following year of planting, the trees which were planted with 5x5 m density, did not give any fruit, and whereas 4x3 m and 4x1.5 m planted trees gave fruits even a little. After the third year, fruit set was observed on all trees. Furthermore, during the first year, the fruit set rate was 0.88%, whereas in the second year it increased to 4.85%. The best plant development and the highest fruit set for Gemlik olive were observed on the trees, which were planted with 4x3 m density and pruned as open vase style.