Abstract: The Cucumber inbred lines and their F1 hybrids were used as materials in this study,the experiment aimed to evaluate the cold tolerance of cucumber by studying the field sprouting rate and sprouting index in April 10th,April 15th,April 20th.Simultaneously,the soil temperature,air temperature and relative humidity under three sowing dates were investigated.The results showed that there was a significant difference in the sprouting ability of different cucumber materials in different sowing time,by which the test materials of this group were divided into three grades.The hybrids of Chang×Jin,Chang×Ning,Xin×Jin,Xin×Ning and Shan×Jin were belonged to strong low temperature resistant materials;the hybrids of Shan×Ning,the lines of Chang×Shan were belonged to mid low temperature resistant materials;the lines of Xintai,Jinyan and Ningyang were belonged to weak low temperature resistant materials.