Application of geographic information system and the principle of statistics, research Chinese Corylus L. distribution, evaluate the climate of the Corylus L. normal region, analysis the impact of climate factors effected on the distribution, and according to the similarity of suitable climate, research Corylus L. interspecific relationship. The results show that: the Corylus L. latitude range from 24?1′ N-51?2′ N, longitude range from 85?5′ E-132?2′ E, the main distribution area distributing from northeast mountainous area of North China, Qinling Mountains and southern of Gansu ，Henan, central of China, to southwest with diagonal distribution, species show normal distribution;vertical distribution from east to west longitude elevation increased gradually with decreasing latitude, There were significant differences in Latitude influence on Corylus L. distribution of altitude. temperature and distribution of Corylus L. showed significant correlation, especially with an average annual temperature and cold temperature ,they are the key factor affecting of Corylus L. distribution; the regression equation between the distribution of plant species and the climatic factors is Y=11.883 - 0.051 X1 0.131 X2 - 0.003 X4-0.004 X5 - 0.001 X6 0.051 X8; according to the climate similarity of Corylus L. distribution area, north of C. heterophylla Fisch and C.mandshurica Maxim. as a class, suitable climate very similar，germplasm genetic closer, C.kweichowensis Hu, C.chinensis Franch., C.fargesii Schneid.,C.yunnanensis A.Ccmus and C.ferox Wall. are into second categories; C.wangii Hu is into third categories.