Control method of dual-system refrigerator

The invention relates to a control method of a dual-system refrigerator. The refrigerator comprises a refrigerator body and a refrigeration composite pipe, a refrigeration chamber, a refrigeration cooling chamber, a freezing chamber and a freezing cooling chamber are defined in the refrigerator body, a refrigeration evaporator and a freezing evaporator are respectively arranged in the refrigeration cooling chamber and the freezing cooling chamber, and the refrigeration composite pipe comprises a refrigeration main pipe section and a refrigeration bypass pipe section. The refrigeration main pipe section extends out of the box body from the refrigeration cooling chamber, the refrigeration bypass pipe section extends out of the box body from a joint part on the refrigeration main pipe section, and a first fan is arranged in the refrigeration bypass pipe section. The control method comprises the steps that in the operation process of the refrigerator, whether a refrigeration evaporator is in a refrigeration state