Open-top chambers ( OTCs) is one of the main methods to study the relationship between global climate change and terrestrial ecosystem and has been widely used in the Tibetan Plateau. Recent advancements in research on the responses of grassland ecosystems to climate warming by using OTCs are reviewed,which cover the areas of plant phenology,community structure biomass,and soil characteristics. We found that warming extended the growth season was due to advanced the timings of green-up and delayed yellow period. Warming would benefit the growth of gramineous plants. Warming made the biomass allocation transferred to the deeper soil layer to adjust the drying conditions. The response of the alpine grassland ecosystems to climate change was uncertain,which was influenced by region,community type and experimental time. The change of soil moisture caused by rainfall and permafrost melts regulated the response of ecosystem to warming by regulating the temperature sensitivity of phenology,NPP and soil under warming. Based on the discussions,several aspects of future research have been put forward.