Abstract: In this study,effects of cooling process on the weight-loss of pig carcasses under environmental humidifier condition and spray-chilling condition were compared. Cooling process of pig carcasses were conducted under the environmental humidifier condition by ultrasonic atomization humidifier increasing environment humidity and under spray-chilling condition by gas-liquid two-phase flow intermittently spraying,and experiment sample without humidification and spray treatment was regarded as control group.The experiment results indicated that the final average weight-loss of samples under environmental humidifier condition( humidity 100%) was 1.442%,and the final average weight-loss of samples under spray-chilling condition for 14 h and then cooling to 24 h was 1.066%,and the final average weight-loss of samples for control group was2.914%. Spray-chilling and environmental humidifier cooling treatment can increase the cooling velocity of pig carcass( p <0.05). The spray-chilling treatment and environmental humidifier treatment can reduce effectively the weight-loss peak time( p < 0.05).Relationship of the weight loss peak time for three groups is spray-chilling < environmental humidifier < control group. Spray-chilling and environmental humidifier cooling treatment can reduce the weight-loss of pig carcasses in cooling process( p < 0.05) significantly.Reducing weight-loss effect for spray-chilling is better than that for environmental humidifier( p < 0.05).