Calves born in winter will show signs of cold stress under low temperature for a long time，and even die in severe cases，which will directly affect the expansion and efficiency of pasture. This paper analyzed the necessity of developing calf warm clothing from the harm of calf cold resistance and continuous low temperature to calves，introduced the design idea of calf warm clothing in detail from the aspects of warmth retention，comfort, air permeability，color fusion and fit and verified the warmth retention and weight gain effect of warm clothing. It provided a reference for improving the welfare of calves，reducing breeding cost and improving benefits.