Abstract: The authors developed a 1-D global carbon cycle model that includes the coupling mechanism of the atmosphere,the ocean and the terrain biosphere,involving two main man-made sources,i.e. the fossil fuel combustion and the land-use change.Results show that there is a good relationship between the simulated and measured values of the temperature,phosphate and total carbon in the ocean;simulated atmospheric CO₂ concentration and ¹³CO₂ fit the observed values quite well.It was founded that traditional models may overestimated the influence of the CO₂ fertilization effect and underestimated the carbon absorbing ability of the ocean.