Life cycle assessment (LCA) based on the cradle-to-gate inventories from factory was used to examine the raw material,energy consumption and environment load of embodied process on the functional unit of 1 m~3 wall product. Moreover,CML-2001 method and database provided by GaBi were used to evaluate environment impact of wall product in the life circle scope. The results were as follows: 1) six impact categories had been assessed in detail in the LCA study: global warming potential (GWP),human toxic potential(HTP),acidification(AP),eutrophication (EP),photochemical ozone creation potential (POCP),abiotic depletion (ADP) and the absolute values were 3.50 *10~(-9),2.11 *10~(-9),1.38 *10~(-10),1.38 *10~(-10),2.33 *10~(-11),1.30 *10~(-12),respectively. GWP and HTP were mainly responsible for the preparation of wall product,accounted for 59.2% and 35.7% of total environmental impacts,respectively. 2) To carry out this analysis,a wood factory was assessed in detail and the process was divided into four stages: the raw material obtaining stage,the glued laminated timber preparation stage,the wood wall preparation stage,the painting and packing stage and the absolute values of each stage were 2.40 *10~(-9),7.32 *10~(-10),4.25 *10~(-10),7.20 *10~(-11),respectively. Raw material obtaining stage was the main stage of environment impacting. 3) Excluding the positive impact of the photosynthesis,HTP was mainly responsible for the environmental deterioration and accounted for 35.7% of total environmental impact. Raw material obtaining,glulam preparation and wall preparation caused the most of HTP. The detailed analysis of each stage identified the most important environmental hot spots of HTP: the wood dust and electricity usage.