Within a CarboEastAsia framework, we, CarboEastAsia Model Intercomparison Project members, are conducting multi model and data analysis aiming at (1) identify the mechanisms that drive carbon cycle, (2) quantify carbon sink/source distribution, (3) develop terrestrial carbon cycle models suitable for Asia, (4) evaluate the influence of land use and climate changes, and (5) provide scientific insight for the role of East Asian ecosystems in global context. At more than 25 eddy-covariance sites in monsoon Asia, we conducted terrestrial carbon cycle model runs using about 10 models (e.g. BEAMS, Biome-BGC, CASA, CLM-CN, PnET, LPJ, TRIFFID, VISIT) from 1901 to 2010, and the model outputs are evaluated with CarboEastAsia dataset. Through the model evaluation with site observation, several common limitations in the model are found. For example, the models overall underestimate the seasonal magnitude of terrestrial carbon cycles (e.g. GPP, NEE) at most sites. The abnormal seasonality in NEE (carbon releases in rainy season in some sites) due to the unique monsoon climate in Asia is not captured by many models. We will report current status of existing terrestrial ecosystem models at CarboEastAsia sites and initial estimation of carbon budget in monsoon Asia, and discuss the issues and ways for further improvements toward our aims mentioned above.