The aim of this study was to determine the effect of an intercropping system on the yield, quality and photosynthetic active reaction (PAR) measurements of some vegetables in Adana (Turkey). The experimental research was conducted under field conditions from 2003 to 2005 at the facilities of the Department of Horticulture and Faculty of Agriculture of Cukurova University. Cauliflower and broccoli were used in the first year; cauliflower, cabbage and lettuce were used in the second year as main crops. Lettuce, pea, leek, garlic and onion were used in the first year; green bean, pea, radish, leek, garlic and onion were used as intercrops in the second year of the research. According to the research results, the intercropping system had no negative effect on the yield and size of the heads of the cauliflower and broccoli. However, the yield and the head size of the cabbages were affected negatively. Leek, onion and garlic performed the best as intercrops, mainly due to their upright growth habit. Radish, pea, green bean and lettuce were unsuccessful as intercrops. Results of this study indicated that the extra income from unit area can be obtained in the small enterprise when cauliflower, broccoli and cabbage were used as main crops and leek, garlic and onion as intercrops.