Abstract: RAPD analysis for mutated seeds of Tanghui-28 generations, which were returned by No.17 returning satellite,plus its field inspection and isozyme, has been carried out. The results were as follows: (1) a biggest mutated individual which was characterized by selected generations’ rich varieties, stable genetic traits, high yielding as well as disease resistance. (2) Excellent selected lines, which combinations’ yield was much bigger than that of contrast, could be used to make high yielding and disease resistance cross a parental lines. (3) There were 2～4 generations earlier ordinary ,that was also to say ,high space mutation could make the breeding programme develop in advance. (4) Their were signifficant genetic differerces among the mutated generations and its selected generations in some areas, such as esterase isozyme,cytochrome exidase isozyme as well as isozyme vigor. (5) RAPD analysis showed that selected lines by space mutation method varied signifficantly in DNA level.