Sorghum is one of the most drought tolerant grain crops and a leading cereal in arid and semi-arid agriculture.Further,The small genome（730Mbp） and its rich genetic diversity for drought tolerance makes it an excellent crop model and choice for studying the genetic and physiological mechanisms of drought tolerance.In recent years,molecular marker technology has been developed and utilized to construct the high saturation linkage mapping,and lay a foundation for studying physiological mechanisms of resistance mechanism,identification and cloning of gene function,molecular marker-assisted selection,directional transfer of favorable genes and gene pyramiding.