NOVELTY - Producing halophilic bacteria, by (a) collecting wastewater or mud from an oil field, culturing bacteria obtained from the wastewater or mud in culture medium, choosing bacteria capable of reducing phenol efficiently, freezing and preserving the bacteria, (b) inoculating the frozen bacteria into a liquid culture medium and culturing, and (c) acclimatizing the cultured halophilic bacteria in a phenol containing inorganic salt solution.    USE - The method is useful for producing halophilic bacteria used for reducing phenol in wastewater generated during oil extraction in industries.    ADVANTAGE - The produced bacteria reduces phenol to 99%.    DETAILED DESCRIPTION - Method for producing halophilic bacteria, involves (a) collecting wastewater or mud from an oil field, culturing bacteria obtained from the wastewater or mud in culture medium containing beef extract, tryptone, and sodium chloride (10-100 g/l), selecting well grown halophilic bacteria, choosing bacteria capable of reducing phenol efficiently, freezing the selected bacteria, and preserving the frozen bacteria, (b) inoculating the frozen bacteria (100 ml) into a liquid culture medium, and culturing the bacteria under vibration at 37 degrees C and 150 revolutions per minute (rpm), (c) acclimatizing the cultured halophilic bacteria in a phenol containing culture medium for 48 hours, (d) acclimatizing the obtained halophilic bacteria in phenol (300 mg/l) containing culture medium for 96 hours, and (e) acclimatizing the halophilic bacteria again in a phenol (500 mg/l) containing culture medium for 96 hours by transferring 10% of the solution from the culture medium containing 300 mg/l of phenol to a phenol containing culture medium with 500 mg/l of phenol concentration, vibrating the culture solution for 48 hours, and vibrating the culture solution for 48 hours again to obtain bacteria capable of growing well in an environment with 6% salt. The step (c) involves (f) inoculating 10 volume/volume% of the cultured halophilic bacteria in a conical bottle (250 l) having 100 ml of phenol, controlling phenol concentration to 100 mg/l, and vibrating the culture medium at 150 rpm for 24 hours, and (g) transferring 10% of the obtained culture solution to a fresh culture medium with same phenol concentration, and maintaining the culture solution in the same condition for 24 hours. The step (d) involves transferring 10% of culture solution from the phenol (100 mg/l) containing culture medium to a phenol (300 mg/l) containing culture medium, and vibrating the culture solution at same temperature for 48 hours, transferring 10% of the obtained culture solution to fresh phenol containing culture medium with same phenol concentration and same volume, and maintaining the culture solution continuously for 48 hours.