Life cycle inventory of woodfree printing paper was investigated to establish the methodology and to evaluate the environmental effects. The major conclusions are as follows:(1) Calculation of CO2 emitted from biomass separately from that emitted from fossil fuel allowed identifying the effect of afforestation and fiber recycle on CO2 emission.(2) Papermaking process, as is the process predominantly using the energy from coal/oil boilers, showed largest emission of fossil fuel origin CO2. Wood chip transportation by ship showed largest emissionof SOx.(3) Simulated increase of deinked pulp usage shows little change of total CO2 emission, but, on theother hand, shows increase in CO2 emission of fossil fuel origin.(4) Above mentioned increase in CO2 emission of fossil fuel origin could be reduced burning the part of waste fibers in high efficiency boiler to generate energy.(5) The method for evaluating afforestation and for allocating boiler energy, and ancillaries datacollection would be the subjects for the future study.