Abstract: Grassland type is an abstract and generalization of grassland resources entity while grassland classification is not only the concrete practice of grassland type theory, but is also one of the foundations of grassland science research and practice. On the basis of bio-climatic features, the grassland Comprehensive and Sequential Classification System (CSCS), sorts grasslands with the same zonal agricultural climate characteristics as one category according to the different heat and humidity grades. The classification retrieval map made by this principle is the mapping expression of CSCS and it has a unique theoretical and practical value. With the increasing improvement and perfection of RS, GIS, GPS and other techniques and the geo-statistical interpolation methods for meteorological indicators, the CSCS in both theory and practice has made many achievements over the last 50 years since it was proposed in the 1950s. This paper systematically summarizes the role and meanings, study advances, and existing problems, as well as research prospects of grassland CSCS, which it is anticipated will provide a scientific basis for its extension and application on a large scale.