The survey volatility beneficial characteristics of the mutants obtained after irradiation treatment three times repeated on the same varieties (IR64, North thorn 7 and CL-9) has selected been some of rice mutation lines have many good agri-biological characteristics and has high selection value. Among them, the type of mutation is low and hard stems have the highest frequency of occurs in all three studied varieties (reaching (0.57 + or - 0.61) percent after two treatment times up the seed North thorn 7). Type of early ripening mutation (short growing time than just the original variety 7 to 10 days) with the greatest frequency (0.34 + or - 0.53) percent in the variety CL-9. Type mutant of elongated grains 7 mm and grain white rice has frequency of appearance in most of the experimental formula is lower than the type of early ripening mutation. Have identified the selective value of rice mutant lines obtained through the survey and evaluation in the next season. The lines of early ripening (DBCS No.9, DBCS No.13, DBCS No.17), the lines of mutation has low and hard stems (DBTC No.8, DBTC No.11, DBTC No. 21), the lines high yield (DBNS No.5, DBNS No.19, DBHT No.2) have a high index of productive potential, and overcome the existing drawbacks of the original varieties.