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As the heat preservation technology is increasingly perfect, convenient degree rise increasingly, the refrigerator has become the family life in the necessary appliances. At the same time, in the earth is becoming a village under realistic, in environmental protection has become a global consensus premise, in people's quality of life the pursuit of continuous improvement, seek a kind of the most environmentally friendly, energy-saving refrigerator technology has become very urgent and necessary. This paper is the design and choice of refrigerator. Refrigerator design includes: according to the requirements to determine the size of a box body, then according to the box dimensions determine the thermal load, according to the thermal load and the other heating elements can be determined the basic energy consumption of refrigerator, and subsequently determining the compressor, and can determine the evaporator and condenser of two main heat transfer equipment, then determine the throttling element and refrigerant charging quantity. Of course, calculation of the design may not be very accurate, finally also needs through test and constant adjustment to the operating system to achieve the optimization.