The creation of multipurpose garden trees on a flat land is different from their creation on sloped lands. Therefore, using methods which help eliminate produced runoff on the sloped land is necessary. In this regard, with the purpose of determining the effect of planting olive seedlings on the rectangular micro – catchment system in comparison to common ways of planting seedlings on sloped grounds, we studied the growth parameters on a sloped ground in Azadshahr in the province of Golestan. Growth parameters were measured in two groups and analyzed statistically. The results showed that there is a significant statistical difference between the two groups in these parameters. So much so that the average difference between the growth of collar diameter of seedlings was 2.8 cm, the average difference between their heights was 43.9 cm and the difference between the crown diameters of seedlings was 32.8 cm. The seedlings showed a better growth in the rectangular system.