Frozen meat products can achieve to be thawed by controlling the temperature, humidity and working time of the defrosting room. When the ambient humidity raches about 75% to 95%,a certain humidity increases the temperature conductive medium. It is by air evaporation of frozen meat product itself, water vapor pressure reducing and atomization naturally reduce the evaporation temperature and air combina-tion. Low temperature and high humidity air go through the cyclic air conveying duct of a special proof variable frequency blower to blow and to formed a uniform airflow on the surface of the product being thawed. By PLC microcomprter automatc phase controling the defrosting temperature, humidity and time curve to achieve to thaw the products.