In this study, life cyle assessment method was used to assess the impacts of wood plastic composite towards the environment. This life cycle assessment consist of 4 phases that are based on the ISO14044 and ISO 14040. The phases are goal and scope definition phase, inventory analysis phase, impact assessment phase and interpretation phase. In the inventory analysis phase, the wood plastic composite were analyse using the FTIR machine. This FTIR machine will produce the result that consist of the compound that presence in the wood plastic composite. After the FTIR analysis, the data were further analyse using openLCA. This software produce the final results for this life cycle assessment with the help of the FTIR analysis.