Abstract: Based on the morphological and anatomical characteristics of vegetative organs,as well as the ecology and geography, Zhao Guang-yi et al. have reported the occurrence of siberian pine(Pinus sibirica) in the Da Hinggan Mountains continuously since 1981, that arouses disputing, The pine cones of the disputing pine were collected in the Mangui Forestry Bureau in the Da Hinggan Mountains, Northeast China, in autumn of 1989. By comparing it with those of Pinus sibirica and P. koraiensis it is proved that the disputing pine in the Da Hinggan Mountains is P. sibirica, but not P. koraiensis. And the 30-year old wrong name of “Mohe Korean Pine” has been corrected. A map showing the distribution of the P. koraiensis and P. sibirica in the DaHinggan Mountains and its adjacent regionswas drawn according to the 10-year investigation.

Key words: Da Hinggan Mountains, P. sibirica, New distribution