This research was carried out in 2010-2011 growing seasons at Top(+)(+)u Station of the Soil Water Resources Tarsus Research Institute, using Karaisali processing pepper. The experimental treatments; Drip treatments consist of full irrigation (DTS), deficit irrigation DI-75, DI-50 and DA-PRD. Irrigation was applied when 25% of the available water in the 60 cm soil depth was used and replenished to field capacity in full irrigation treatment. Highest yield in drip system was obtained from the DTS treatment followed by DKS-75. DKS-50 and DS-PRD resulted in lowest yield. Although, DS-PRD and DKS-50 received the same amount of water the resulted in lower yield than DA-PRD in both years. In the drip system, the lowest WUE was obtained from the DTS treatment (5.5 and 5.8 kg m(-3)) while the highest WUE was found in DA-PRD treatment (7.7 and 7.5 kg m(-3)) in both years. In general, the highest WUE value as attained under water stress conditions, WUE decreased with increasing the water quantity. The results revealed that in drip irrigation DTS treatment which was irrigated when 25% of available water in the 60 cm soil depth was used and brought to field capacity, was recommended. Under water scarcity conditions, DKS-75 treatment can be recommended. Fruit weight, fruit size (width and length), fruit flesh thickness and fruit firmless were higher in DTS treatment. Fruit number per unit area was higher in water stress treatments. Net profit ranged between 5128 to 7869$ ha(-1) in 2010 and 4933 to 8871$ ha(-1) in 2011 according to the irrigation treatments. Net profit was the highest under full irrigation treatment (DTS) under drip irrigation system.