Abstract: The growth, swarming and production of halo-zone by six different strains of P. mirabilis were examined on different selective media. Inability of strains to grow on different selective medium commonly showed at 25°C. The swarming did not observe on Baired-Parker stable base agar and cetrimide agar medium at both used temperatures (25 and 37°C); whereas no swarming observed on desoxycholate citrate lactose agar medium at 25°C and on violet red bile agar medium at 37°C. Both strains (PM4 and PM5) were able to produce hydrogen sulfide (H2S) at both used temperatures; in contrast, the other two strains (PM2 and PM3) were H2S negative. But PM1 and PM6 were H2S positive at 37°C and negative at 25°C. Several compounds inhibit the motility of swarmer cells by disturbing the structural integrity, the activity of flagella or by blocking their ability to move. Those compounds may also inhibit swarming but without affecting growth.