This study was conducted at the Poultry Farm, Department of Animal production, Faculty of Agricultural Sciences, University of Sulaimaniin Bakrajo. The experiment started from 5/2/2010 to 10/4/2010. A total of 225 one-day old broiler Ross 308 chicks were used. The chicks weighed and distributed randomly into 5 treatments groups each with 3 replicates of 15 chicks per replicate. Treatments were as follows: control: soybean meal basal diet, the first treatment T1: 20% raw full fat soybean (FFSB) in the diet for the stages starter, grower, and finisher. The second treatment T2: 40% of FFSB in the diet for the stages starter, grower, and finisher. The third treatment T3: 20% FFSB treated by soaking for 6 hours with heating on temperature of 120-130˚c for 20 minutes for the stages starter, grower, and finisher. The fourth Treatment of T4: 40% FFSB treated by soaking for 6 hours with heating on Temperature 120-130˚c for 20 minutes starter and grower phases and 30% treated FFSB soaked and heated for the finisher stage. Results indicated that treatment soybeans significantly caused variation in body weight and weight gain. Birds in the third and fourth treated groups showed highest live body weight (P<0.05) and had better feed conversion ratio (p < 0.05) at 38 and 42 days. Highest production index (p < 0.05) was observed in birds fed soaked and heated FFSB. Control group was superior (p < 0.05) for dressing percentage. It was concluded that feeding different replacement levels of treated FFSB by soaking and heating resulted using in better productive performance in broilers at all marketing ages.