In order to study the effect of intercropping (mix cropping) of three sesame genotypes (Sabzevar, Kashmar and Kalat) a field experiment was conducted based on a Complete Randomized Block Design with three replications at Research Station, College of Agriculture Ferdowsi University of Mashhad, in year 2009. The experimental treatments were: sole cultivation of Sabzevar, Kalat, Kashmar genotypes, and their intercrops (Sabzevar with Kashmar, Sabzevar with Kalat, Kalat with Kashmar), respectively. The results showed that the highest grain yield was observed in Sabzevar-Kashmar (1029 kg/ha) and Sabzevar-Kalat (1016 kg) treatments, and the lowest was obtained in sole cultivation of Kalat (770/7 kg). Sabzevar-Kashmar treatment had the highest amount of other morphological parameters such as plant height, number of main nodes, biological yield and number of branches compared with other treatments. The highest growth rate (CGR) was observed in Sabzevar-Kashmar treatment, too. Sabzevar-Kashmar along with Kalat –Sabzevar treatments had the highest amounts of other morphological criteria such as leaf area index (LAI), net assimilation rate (NAR), relative growth rate (RGR); and sole cultivation of Kalat treatment had the lowest mentioned criteria. In the sole cultivation of different sesame genotypes, the highest grain yield and other growth characteristics were obtained in Sabzevar, Kashmar and Kalat genotypes, respectively.