The ohmic heating is a great potential thawing method.In this experiment,we studied the effects of freezing size and voltage gradient on the thawing time,thawing rate,water loss rate,thawing temperature homogeneity and energy utilization rate.The frozen pork were cut into 3 cm,4 cm and 5 cm diameters and 6 cm long,and thawing temperatures were set from-18 ℃ to 5 ℃.The tests were performed under different voltage gradient at 20,30,40 V/cm.The results showed that there were not significant effects of voltage gradient and size on the temperature homogeneity,thawing loss rate and energy utilization rate.However,the voltage gradient and sample size had great influence on the thawing time.In detail,thawing time was decreased with the increase of voltage gradient,and increased with sample size.The effects of voltage gradient and size effects on thawing rate were divided into two stages.Below the pork freezing temperature,the voltage gradient and pork size had little influence on the thawing time;above the initial freezing temperature,with the voltage gradient increased the thawing rate increased,but with size increased,the thawing rate was decreased,obviously.Ohmic heating method has great advantages than traditional water thawing method.