Hybrid Rada was developed with simple cross of Bulgarian line cms2607 and mutant line 12002 R. Mutant line was developed after treatment of immature sunflower ( Helianthus annuus L.) zygotic embryos of fertility restorer line R 2574 with gamma irradiation at dose of 8 Gy for 1 min. Hybrid Rada was tested for three years in testing plots of Dobroudja Agricultural Institute ' General Toshevo and for two years at the seven locations of State Variety Testing Commission. The ANOVA procedure proves that the parents (2607 A and 12002 R) and the received hybrid Rada are with different genetic potential in the studied indices. In our study all six characters recorded positive and significant heterosis in the direction of both relative to parental average (h1) and relative to better parent (h2). The correlations of the hybrid Rada with the mean values of the parental lines (h1) and with the mean value of the parent with higher indices (h2) were statistically significant. In h1 the variation was from 1.52% to 17.92%; in h2 the variation was within 1.49'12.81%. The highest positive heterotic effect (h1 = 17.92%) in the hybrid Rada was for trait seed yield per head relative to parental average h1. The model of inheritance of studied indices is additive dominant with partial or full dominance in relation to parent with the higher value. This was markedly expressed for indices seed yield per head.