Abstarct: An experiment was conducted for investigation the effects of planting pattern, plant density and row spacing on yield and yield components of corn a filed experiment was carried out in research farm of Agricultural college, Shahrood University of technology, in split split plot design baxsed on RCBD with four replication. The main factor was plant density (A) include: a1=70000, a2=85000 and a3=100000 plant.ha. sub factor was row spacing (B) in cluede:b1=70, b2=75, b3=80 cm. sub sub factor was planting patter n(c) inclued: c1=convention, c2= two row planting. The results of this study of plant density on height of plant, diagonal of stem, number of leaf, arid weight of leaf, arid weight of stem, arid weight of ear, arid weight of ear skin, number of seeds in row, number of row in ear, 100 seed weight, weight of ear stick, weight of grain in ear, total arid weight and Harvest Index were significant. In this research, the greatest effect on grain yield was obtained from 85000 plant.ha-1. The effect of row spacing on ear skin weight, ear stick weight, total arid weight, arid weight of leaf, arid weight of stem, arid weight of ear were significant and 80 cm row spacing had the highest effect on above-mentioned quality. Effect of planting pattern on all above quality except arid weight of stem, arid weight of leaf and number of ear were significant and two row planting had the highest effect on above-mentioned quality. The results of growth analysis showed that process of TDM, LAI, CGR, RGR, NAR dependant on different plant density, row spacing and planting pattern.