[Objective]To study the variation trend of biological traits about ~(60)Co radiation-induced mutant strains of Festuca arundinacea. [Method]The test was based on the six stable and different drought resistance ~(60)Co radiation-induced mutant strains G-4,G-6,G-8,G-9,G-12,G-13 and introduced variety Airui No. 3( control) as the materials,using the DPS statistical analysis method,the variance analysis was conducted on the test data of seven biological traits: leaf length,leaf width,crown diameter,plant height...