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This study is concerned about the characteristics of ultrasonic-energy-added W/O type emulsified fuel. The distilled water was mixed with diesel oil by using ultrasonic energy fuel feeding system and then the SMD of sprayed droplets was measured to find out atomization characteristics of emulsified fuel by using the Malvern 2600 system. The capacitance value was measured to verify stability of the same specimen by using the digital LCR meter, EDC1630 additionally.The main results are as follows; 1) The more measuring distance increases between one hole nozzle tip and analyser beam, the more SMD increases. 2) The more water content increases, the more capacitance value increases depending on the time. Main Parameters of the study are the amount of water content, 0~30% by 5% in emulsified fuel, and the measurement distance, 20~140mm by 10mm or 20mm, between nozzle tip and analyser beam.