Combined with the lignin-based binder,the manufacture of wooden composites had an important impact on ecological environment. In order to investigate the feasibility of environment-friendly wooden composites,life cycle assessment (LCA) of hybrid modified industrial lignin/wood fiber composites (HMIL/WF) was carried out by GaBi 6.0 software. The main environmental impact categories including Abiotic Depletion (ADP),Acidification Potential (AP),Eutrophication Potential (EP),Global Warming Potential (GWP),Ozone Layer Depletion Potential (ODP),and Photochemical Ozone Creation Potential (POCP) were analyzed. Results show that in the three subsystems of LCA,the fibers preparation subsystem was the main contributor to most impact categories, followed by board forming subsystem and board finishing subsystem. GWP as the greatest influence factor contributed 73.09% to the environmental impact, followed in order by AP,POCP,EP,ADP and ODP. Thermal energy production had the greatest impact on the environmental load,with the total contribution rate up to 44.77%,followed by electricity production,H_2O_2 production,ammonium lignosulphonate (AL) production,and transport. The highest GWP,AP, POCP,EP and ADP values were generated during thermal energy stage,while the transport stage had the highest value towards ODP. The total environmental impact of HMIL/WF composites (4.22 *10~(-9)) was 10.4% less than that of conventional medium density fiberboard (MDF) (4.71 *10 ~(-9)).