The invention provides a control method used for a thawing plant. The thawing plant comprises a cylinder, a plant door body, a radio frequency generating module and a radio frequency antenna, whereinthe cylinder defines a thawing chamber used for holding a to-be-handled food; the plant door body is arranged at a picking and placing opening position of the thawing chamber and is used for opening and closing the picking and placing opening of the thawing chamber; and the radio frequency antenna is arranged on the inner wall of the thawing chamber and is electrically connected with the radio frequency generating module. The control method comprises the following steps of judging whether the to-be-handled food is placed in the thawing chamber or not, if yes, the radio frequency generating module can work under control, and if not, the radio frequency generating module does not work. According to the control method provided by the invention, when there is no to-be-handled food (including that the to-be-handled food is too few) in the thawing chamber of the thawing plant, the radio frequency generating module stops working, so that dry burning phenomenon is avoided, i.e., the phenomenonthat radio frequency generating module is damaged due to long-term no-load operation is also avoided, and therefore, the fault rate of the thawing plant is reduced, and generation of undesirable energy consumption is avoided.