Studying the right strategy in the implementation of the mitigation of reducing GHG emission in an effort to control climate change caused by deforestation and forest degradation (REDD +) in Papua Province is an important step that must be done. Emission levels in Papua Province in 2010 was dominated by forestry sub-sector and other land use in the amount of 639,818,463 ton CO2eq or approximately 99.8% from the total of GHG emissions of 640,737,952.64 ton CO2eq. To analyze the implementation strategy of mitigation (REDD +), the calculation of the level of carbon emission must be done first. The calculation of carbon emissions for this sub-sector is done by referring to the method that has been developed by the IPCC GL-2006. Meanwhile, to sub-sectors of forestry and other land use, the calculation used the historical and forward-looking approach. The level of carbon emissions from forestry sub-sector accounted for 921,779,031.23 ton CO2eq (historical method) and 1,052,683,205.46 ton CO2eq (forward-looking method) of mitigation program at the end of 2020. Strategy of mitigation action program was for carbon uptake and carbon storage stabilization. The mitigation scenario for forestry sub-sector capable of reducing emissions was by 552,303,873 ton CO2eq or by 52.47% of the total cumulative emissions at the end of 2020 (forward-looking method).