This experiment was conducted in research station of ARSANJAN University in 2000, in a Piece of land with a clay texture. In order to evaluate the different ratios of CORN and SOYBEN intercropping, in comparison to pure culture a Randomized complete block design with 4 replications. Was adapted Treatments consist of: p 1=pure corn, P 2=pure soybean, P 3=50% corn + 50% soybean, P 4=%75 corn + %25 soybean, P 5=%75 soybean + %25 corn. This Experiment was conducted by using replacement system. Evaluated factors are as follow: soybean and corn seed yield in pure culture and intercropping, land Equivalent Ratio, Relative corn yield, Relative soybean yield, Aggresivity. Results showed that the treatment with %75 SOYBEAN + %25 CORN whit LER= 1.19 and also the treatment with %50 soybean + %50 corn with LER= 1.11 have preference %9 and %11 respectively higher yield compared to pure culture. Also as for the aggresivity, in treatment with %50 corn + %50 soybean and also with %75corn + %25 soybean, corn was dominant. Finally the best treatment was %75 soybean + %25 corn with %19 efficiency compared to pure culture.