A control method of a refrigerator comprising an ice making chamber having an ice making tray , an ice making chamber refrigerant pipe contacting a bottom of the ice making tray to supply cool air to the ice making tray , a drain duct of an inclined structure disposed below the ice making tray , and an ice making chamber circulation fan to circulate air in the ice making chamber , the control method comprising: determining whether a temperature of the ice making chamber is lower than a predetermined temperature, turning on the ice making chamber circulation fan , when the temperature of the ice making chamber is higher than the predetermined temperature, and turning off the ice making chamber circulation fan , when the temperature of the ice making chamber is lower than the predetermined temperature, re-driving the ice making chamber circulation fan to prevent frost from being formed in the ice making chamber upon determining that the temperature of the ice making chamber is lower than the predetermined temperature when a refrigerant flows in the ice making chamber refrigerant pipe and the ice making chamber circulation fan is turned off, wherein re-driving the ice making chamber circulation fan comprises re-driving the ice making chamber circulation fan a) for a predetermined period of time when the temperature of the ice making chamber is lower than the predetermined temperature, or b) until a temperature of the ice making tray is equal to the temperature of the air in the ice making chamber , or c) until a temperature of the drain duct is equal to the temperature of the air in the ice making chamber . determining whether a temperature of the ice making chamber is lower than a predetermined temperature, turning on the ice making chamber circulation fan , when the temperature of the ice making chamber is higher than the predetermined temperature, and turning off the ice making chamber circulation fan , when the temperature of the ice making chamber is lower than the predetermined temperature, re-driving the ice making chamber circulation fan to prevent frost from being formed in the ice making chamber upon determining that the temperature of the ice making chamber is lower than the predetermined temperature when a refrigerant flows in the ice making chamber refrigerant pipe and the ice making chamber circulation fan is turned off, wherein re-driving the ice making chamber circulation fan comprises re-driving the ice making chamber circulation fan a) for a predetermined period of time when the temperature of the ice making chamber is lower than the predetermined temperature, or b) until a temperature of the ice making tray is equal to the temperature of the air in the ice making chamber , or c) until a temperature of the drain duct is equal to the temperature of the air in the ice making chamber . a) for a predetermined period of time when the temperature of the ice making chamber is lower than the predetermined temperature, or b) until a temperature of the ice making tray is equal to the temperature of the air in the ice making chamber , or c) until a temperature of the drain duct is equal to the temperature of the air in the ice making chamber . <EOS>