For the purpose to develop of method for treatment of male hypofertility the efficiency of gadolinium orthovanadate nanoparticles (NP GdVO4) in rats with neonatal induced reproductive disease, has been investigated. The progeny of intact rats parents were exposed to emotional stress (Maternal separation stressn) and received an excessive amount of the blend of phytoestrogens (Ph) with mother's milk (1st group) from 3 to 22 day life. At the age of 10 months males received NP GdVO4 (0.33 mg/kg; 2nd group) or speman (158 mg/kg; 3rd group) with feed over the 70 days. Sexual behavior and fertility of males were investigated; the integrated indicator of reproductive potential (FI) was calculate and was estimated with the data of animals from group Control who were given vehicle (water). In the 1st group sexual behavior of males was characterized by accelerating sexual responses on female (double shortening of mounting and intromission latency) and a reduced ability to achieve ejaculation and to start the second round of copulations. The less females have been inseminated by these males (67% vs. 91% in Control group), but almost all became pregnant. As a result of the neonatal induction deterioration in the quality of male gametes intrauterine pregnancy loss increased more than twice, and the total number of foetus decreased (on 21%). These changes have led to a reduction of the male integrated indicator of reproductive potential (Fi) in 2.6 times compared with control animals. Using a NP GdVO4 rehabilitated male sexual behaviour indicators to Control group level, resulting in an increase in the number of fertilized females (up to 95%). In pregnant females decreased fetal losses (up to 15.2% vs. 18.1% in control, p<0,05) and increase in the number of fetuses (on 25%, p<0,05) that shows an improvement in the quality of sperm. The integrated indicator of reproductive potential (F1) increased to (8.3 ± 0.5) vs. (3.0 ± 0.3) u. in the 1st group (without treatment), that statistically higher than in groups Control and 3rd. Application of NP GdVO4 in rats with neonatal inductive pathology of the reproductive function and metabolic disorders normalizes sexual behaviour, the quality of sperm that restores male fertility and improves reproductive potential much more efficiently than the reference drug speman.