A refrigerator, comprising: a refrigerator body having an open front side to define a first compartment ; a primary door mounted to the refrigerator body and used for opening/closing the first compartment , the primary door defining a second compartment having an open front side; and a secondary door mounted to the primary door and used for opening/closing the second compartment , the secondary door comprising a state adjustable door panel , and the state adjustable door panel being configured to controllably change transparency such that the visibility of an internal structure of the second compartment is adjustable; characterized in that a rear wall of the primary door is provided with an air supply port and a return air port which are communicated with the first compartment and the second compartment ; the rear wall is hollow, a condensation removing air duct communicated with the first compartment is defined in the rear wall , and a plurality of condensation removing holes communicated with the second compartment and the condensation removing air duct are formed in the front surface of the rear wall backwards; the refrigerator is configured to: be in a cooling cycle mode where air in the first compartment enters the second compartment through the air supply port and then returns to the first compartment through the return air port ; or in a condensation removing mode where the air in the first compartment enters the condensation removing air duct , so as to allow part of the air flow to flow to the front surface of the rear wall through the condensation removing holes to remove surface condensation of the rear wall . a refrigerator body having an open front side to define a first compartment ; a primary door mounted to the refrigerator body and used for opening/closing the first compartment , the primary door defining a second compartment having an open front side; and a secondary door mounted to the primary door and used for opening/closing the second compartment , the secondary door comprising a state adjustable door panel , and the state adjustable door panel being configured to controllably change transparency such that the visibility of an internal structure of the second compartment is adjustable; characterized in that a rear wall of the primary door is provided with an air supply port and a return air port which are communicated with the first compartment and the second compartment ; the rear wall is hollow, a condensation removing air duct communicated with the first compartment is defined in the rear wall , and a plurality of condensation removing holes communicated with the second compartment and the condensation removing air duct are formed in the front surface of the rear wall backwards; the refrigerator is configured to: be in a cooling cycle mode where air in the first compartment enters the second compartment through the air supply port and then returns to the first compartment through the return air port ; or in a condensation removing mode where the air in the first compartment enters the condensation removing air duct , so as to allow part of the air flow to flow to the front surface of the rear wall through the condensation removing holes to remove surface condensation of the rear wall . be in a cooling cycle mode where air in the first compartment enters the second compartment through the air supply port and then returns to the first compartment through the return air port ; or in a condensation removing mode where the air in the first compartment enters the condensation removing air duct , so as to allow part of the air flow to flow to the front surface of the rear wall through the condensation removing holes to remove surface condensation of the rear wall . <EOS>