Based on 112 questionnaires about under-forest economy from different forest regions in Heilongjiang Province,this paper stands on the perspective of working families and uses multiple linear regression analysis to analyse the influencing factors of developing under-forest economy in Heilongjiang province.The result shows that the family-business area,family labor quantity,household wage income,the attention of forestry technology and forestry subsidies have significant effects on the development of under-forest economy.Recommendations to promote the development of forest economy are put forward.