Abstract: Seeds of a pure breeding sorghum ‘Jinliang No.5’(CK) were treat ed by Chinese Reversal Man_made Satellite in 1996. A dwarf and earliness mutant (SP3) was obtained by selection from the returned seeds next year. The mutant has showed dwarf and earliness in subsequent 4 years. Comparing the SP3 with the control, there are many differences as follows: (1) The maturing period of the SP3 was 15 days earlier and the height of SP3 plant was 40 cm shorter than the control. (2) The SP3 ear length inceased 3.9 cm and the kernel number per ear inceased 400. (3) The average 1000_grain weight of SP3 is 34 g and the control was 27 g. (4) The leaves of SP3 are shorter, narrower and thicker. So their leaf area deceased 43%～22%. (5) The length of ear axis for mutant increased 36% and the length of internode reduced 67%～15%. (6)The content of leucine in SP3 seeds increased 15%, soluble sugar of mutant increased 25%,its tannin decreased 30%.