Among various environmental contaminants, As is considered to be one of the most toxic heavy metal pollutants. Since the cleaning process of As-polluted soil has an adverse impact on human health and environment development of an e cient As removal process from soil is urgently required. In this study, high-power ultrasound (US) with 1,200 W at 28 kHz with HCl and NaOH was used for the elution of As from the polluted soil. To identify the optimum parameters, the US washing parameters such as power of exposure, exposure duration, and acid/alkaline concentration were systematically varied for the optimal washing process. An atomic absorption spectroscopy system combined with a hydride vapor generator was used to analyze As concentration in the liquid and solid parts after the washing extraction. When the US output power varied from 200 to 1,200 W, the 1,200 W US washing reached the As elution rate of 97% and 99.6% in the presence of 2 M HCl and 2 M NaOH, respectively for 1 h US operation. Compare to the soil washing method using the shaker, US washing method demonstrated the preferable results under the same experimental conditions. In the US washing extraction of As, the high-power US caused the pulverizing of soil lump enhancing the interaction of chemical additives with the contaminated soil. The result from the X-ray Di raction and X-ray uorescence analyses also indicated no signi cant change in terms of chemical composition and crystallite pro le of the soil after treatment.