Soil microorganisms in addition to increasing availability and uptake of plant nutrients, increase plant tolerance to biotic and abiotic stresses , so, improve plant yield in unfavorable environmental conditions. Behavior and performance of each microorganisms in the rhizosphere can influenced by other microorganisms. Interaction between rhizospheric microorganisms can be indirectly alter plant growth and its yield. This study was conducted to evaluate the effect of co-inoculation of entophytic fungi Piriformospora indica and four plant-growth-bacteria in nonsaline and salinity stress conditions on maize in greenhouse soilless culture Research Center, Isfahan University of technology. Treatments included two levels of fungi (with and without fungi), 5 levels of bacteria ( Azortobacter chroococcum , Azospirillum lipoferom , Herbaspirillum seropedicae , Pseudomonas putida and control without bacteria) and two salinity levels (0 and 150 mM NaCl). Co-inoculation of the P. indica and Azotobacter bacteria in non-saline conditions caused to increase the amount of K + in shoot and also the activity of catalase and peroxidase enzymes. In salinity condition and in presence of these microorganisms, shoot dry weight, phosphorous concentration in shoot and root parts of plant and potassium concentration in shoot increased, but, catalase and peroxidase activity, the ratio of Na + to K + in shoot and shoot sodium concentration decreased in compare to the controls. Co-inoculation of the fungus and Azospirillum bacterium in nonsaline condition, increased the activity of catalase and also the concentration of Na + and K + in the shoot, but in salinity stress, these relationship caused an increasment in root and shoot dry weight and phosphorous concentration and an decline in Na + concentration in root. The ratio of Na + to K + in the root and catalase and peroxidase activity in the shoot part of plant. In non-saline condition and co-inoculation of P. indica and Herbaspirillum , root dry weight and sodium and phosphorous contents of shoot, increased. However, in salinity stress condition the concentration of potassium and phosphorous in the shoot and root, respectively increased and decreased, but, sodium concentration in root and the ratio of Na + to K + in the shoot, decreased. Co-inoculation of P. indica and Pseudomonas in non-saline condition, increased phosphorous content in the shoot but, decrease the activity of catalase and peroxidase and shoot dry weigth. However, under salinity stress, shoot dry weight and phosphorous concentration in the shoot and root increased, but shoot and root sodium concentration and the ratio of Na + to K + in the shoot part of plant decresed. Keywords: Piriformospora indica , PGPR, salinity stress, Zea mays L.