Abstract: In order to estimate the character of cold-resistance in winter wheat rapidly, two varieties samples with different cold-resistance were planted under indoors and outdoors respectively. To know the differences of damaged degree in two materials, the electrical conductivity method shows the degree of plant damage and survival rate were detected. The results showed that, the damaged degree of cold hardy variety indoors were the same at -24℃ for 5 days and cold sensitive variety were the same at -18℃ for 5 days. The survival rates of cold hardy variety indoors were less than 50% at -12℃ for 7 days, but the cold sensitive can survive less than 50% for one day. After freezing treatment there are no significant differences on survival rates between indoors and outdoors. The lethal temperature of cold hardy variety DNDM1 was -32℃ but JM22 was -15℃.