Abstract:Abstract:According to the ecological benefits of natural forest protection project of 10 years of monitoring data in Hubei province, and by using conversion method of ground live tree timber volume into biomass, and then according to photosynthesis making relationship between organic compounds and carbon fixation and oxygen release, preliminary study was carried out on the total amount of annual carbon fixation 3.593×106t and the total amount of annual oxygen release 9.621×106t, the average value of carbon fixation and oxygen release photosynthesis were 4.311 billion Yuan and 3.632 billion Yuan respectively. Therefore, scientific and objective assessment of the benefits of carbon fixation and oxygen release of natural forest protection project, which provide basic data and methods for monitoring the effects of natural forest protection project and research of carbon fixation.