Landscape construction, management and maintenance, are important issues that in recent years have drawn much attention. Landscape is of valuable because of its role in air refinement and improving people life quality. One of the major limiting factors in urban landscape development is providing the plants with sufficient water. One of the general principles toward sustainable management of landscape and water-wise landscaping, is applying of low quality water sources such as recycled water. Due to the limited water resources available, the use of this resource is inevitable in agriculture and green space. Planting trees with low water demand like olive trees is considerd by landscape designers. Convenient irrigation systems generally may cause serious problems when wastewater is water resource, therefore new and proper irrigation systems should take into consideration. In order to investigate the impact of water quality and its application method on olive trees an experiment was carried out during 2010-2012 in Isfahan University of Technology. The eight-year old and one-year old olive trees were irrigated by two irrigation systems including a new subsurface-leaky irrigation (SLI) system and surface irrigation in line with irrigation with clear and recycled water for two years. The results revealed that wastewater could enhance growth indices like, leaves surface, height, shoot growth and chlorophyll content, too. In addition recycled water enhanced nutrient elements nitrogen, phosphorous, magnesium (N, P, Mg) in leaf of plants. Applied recycled water improved photosynthesis and stomata conductance. Irrigating trees by SLI system could enlarge leaves area, enhanced annual growth, chlorophyll content and growth of current year, but decreased soluble sugars and proline contents. In addition, SLI system enhanced total stomata number, open stomata and photosynthesis. Trees grown under SLI irrigation system surprisingly showed 76% elevation in growth when compared to surface irrigation. N in trees grown under SLI irrigation system was higher than surface system. To sum up, this experiment showed that recycled water could be a promising resource for landscape trees irrigation. Also SLI irrigation system is more efficient in irrigation in urban landscape when compared to surface irrigation. Key word : landscape, SLI irrigation system, wastewater, olive, element, stomata