Tremex fuscicornis is the the main harm in poplar and willow and other broad-leaved trees,and it has 1 generation in 1 year in Jiamusi city,with eggs in plant xylem overwintering.The morphological and biological characteristics of Tremex fuscicornis were introduced,and the life history characteristics and occurrence regularity of it were introduced through observation,meanwhile the prevention and control measures were discussed.These would be helpful for grasping the occurrence regularity of Tremex fuscicornis,providing a technical support for control this garden stem borer.