Abstract: Based on phenology data of 26 agro meteorological stations in Heilongjiang province during 1998-2008,the woody plant evolution of Syringa oblata,Salix matsudana,Ulmus pumila and Populus simonii was analyzed.The results showed that Salix.matsudana got into the bud opening from late March to late April,which was earlier than the other three species.The beginning of leaf expansion of the four plants was concentrated in late April to mid May.They all got into first flowering from late April to late May.The fruit ripening period of Salix matsudana and Ulmus pumila were in late May to June,but Populus simonii were in late May to late June.The primary leaf color changing of the four species were concentrated in mid September to mid October,the leaf falling were concentrated in late September to late October.The four species showed a delaying trend in both spring phenology and autumn phenology.The date of exuberance,flower flourishing and leaf color changing of Syringa oblate delayed obviously.The same as the date of flowering,leaf color changing and leaf falling of Ulmus pumila,and also for the autumn phenology of Populus simonii.There was no obvious change for growth season of four species,but part of region changed significantly.

Key words: Heilongjiang province, Woody plants, Phenology