The aim of this study was to evaluate the effects of bird density and the consequences of adding dietary vitamin E on broiler performance, blood metabolites, gastric bacterial enumeration, bone contents and the humeral immunity. A total number of 180 one day-old Arbor Acres broiler chickens were randomly divided into 4 equal groups. Each group was subdivided into 3 replicates containing 15 chicks each. The first group was housed at density of 10 birds/m² and served as the positive control. The second group was housed at density of 12 birds/m²and served as the negative control. The first and second groups were fed the basal diet.  The third and fourth groups were housed at density of 12 birds/m², and were fed the basal diet supplemented with vitamin E at either 100mg/kg diet (third group) or 200mg/kg diet (fourth group). The results indicated that birds kept under high stocking density showed reduction of growth performance, plasma metabolites and immune response of broilers. While, the immune response of broilers was improved by dietary vitamin E supplementation under the intensive density. In ileum and ceca, the bacterial count was improved when all pathogens counts (E.coli, Salmonella and Clostridium) were decreased in birds reared at density of 12 birds/m² but fed diets supplemented with vitamin E even 100 and 200 mg/kg. It can be concluded that, under high stoking density condition, vitamin E supplementation can improve the production performance and the immune response of broiler chickens.