The Qinghai-Tibetan Plateau has the largest area of natural grassland in China. The long\|term localized observation and investigation of grassland ecosystem flux on the plateau play an important role in the world. On the basis of generalizing the main methodologies of ecosystem flux, we made a general summary of research achievements, including carbon sources or sinks, spatial and seasonal variations of carbon fluxes, as well as the relationship between carbon fluxes and environmental factors. In present study, the seasonal variations of carbon fluxes and carbon sources or sinks had obvious differences in various vegetation ecosystems, and were mainly controlled by photosynthetically active radiation, temperature, precipitation, soil moisture and leaf area index. Additionally, in accordance with the realities and necessities of ecosystem flux research on Qinghai-Tibet Plateau, the existing problems and approaches were discussed in detail. It was suggested that multiscale, long-term ecological tests and observation data support were needed in the future research, and based of which new data processing and analysis and mechanism simulation method should also be developed to build models of Qinghai-Tibetan Plateau ecosystem carbon cycle.