Forest can capture and sequester carbon dioxide in the atmosphere by photosynthesis.It is helpful for emission reduction(sink) and is an important part of climate mitigation.The development of forest is also bringing some non-carbon benefit for people.The expansion of forest area,increase of forest stock and the comprehensive benefits of non-carbon benefit are related closely with forestry investment.The forestry policies changed in different periods and the forestry investment changed accordingly since the People's Republic of China was established.This paper evaluated the efficiency of forest carbon sequester of forest investment from 1950-2013 and the comprehensive efficiency of forest investment from 1990-2014 by DEA Model.The result shows the efficiency of forest sequester of forest investment is declined,which mainly influenced by pure technical efficiency and scale effect score.The comprehensive efficiency is mainly influenced by scale effect score.Considering the change of scale and structure of investment,the external environment and forestry policy,forestry management and technique innovation,management of fund,forestry nature and forestry management and protection are the major reasons for the low efficiency of forest carbon sequester of forest investment;and the comprehensive efficiency is influenced by forestry conservation policies,the reform of forestry enterprises and the development of forestry economy.