The different levels of the interactions between the atmosphere and the biosphere are analysed through the three different levels of the composition of the Biosphere. From this framework, the characteristics of different atmosphere-biosphere interaction models are analysed and it is pointed out thatthe atmosphere and the biosphere are fully and dynamically coupled, and it is essential to build up the intereaction model at the level of atmophere-phytosphere(vegetation) in this paper.By the detailed description of land surface physical processes and physiological processes of vegetation-not only photosynthesis and respiration,but also other processes such as allocation and phenology—the physical fluxes and biogeo-chemical fluxes can be simulated simultaneously and influence each other in the model.