A refrigerant circulation system of a refrigerator is provided to apply a bypass structure to a refrigerant circulation system to apply a constant speed compressor to the refrigerant circulation system in which a refrigerating compartment evaporator and a freezing compartment evaporator are connected in parallel, thereby operating a parallel cycle efficiently regardless of types of compressors. A compressor(11) compresses refrigerant. A condenser(12) condenses the refrigerant passing through the compressor. A refrigerating compartment expansion valve(142) and a freezing compartment expansion valve(141) are branched from an outlet of the condenser. A first valve(13) controls a flow direction of the refrigerant flowing into the refrigerating compartment expansion valve or the freezing compartment expansion valve. A refrigerating compartment evaporator(151) and a freezing compartment evaporator(152) are connected with outlets of the refrigerating compartment expansion valve and the freezing compartment expansion valve. A bypass pipe(20) supplies refrigerant of an outlet of the freezing compartment evaporator to an inlet of the refrigerating compartment evaporator when the refrigerating compartment is operated solely. A second valve(16) is installed at an inlet of the bypass pipe for converting a flow direction of refrigerant. If the refrigerating compartment and the freezing compartment are operated at the same time, the refrigerating compartment expansion valve and the freezing compartment expansion valve are opened by the first valve, and the inlet of the bypass pipe is closed by the second valve.
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