Climate changes characterized by higher temperatures, extreme climatic hazards and low water for agriculture determine the extension of the areas affected by drought. Agriculture is most affected by the climate variability, the extreme meteorological phenomenom, diminishing the seed yield. Sunflower is considered to be moderately resistant to drought, but in hot conditions, the plants suffer reduction in fertility, yield performance and quality of products. In literature there are mentioned some adoptive mechanisms of plants to drought: escape, avoidance and tolerance, as well as their genetic variability. For sunflower it is very important to increase the cold resistance in early development stages, at stage of germination, emergence and the stage of 2-3 leaves, in order to facilitate an early sowing. Wild Helianthus species are a very valuable source of resistance in increasing drought resistance as well as resistance to low temperatures in sunflower. In our research work we have used different sources from our sunflower germplasm collection, some of them coming from the interspecific hybrids between wild H. argopyllus and cultivated sunflower. Some of our best elite lines have been introduced in a process of improvement of resistance to drought, using recurrent selection. Also it has been transfered some genes for controling the attack of some important pathogenes. In this process of selection, we obtained inbred lines (CMS and pollen fertility restorer lines) having very good tolerance to drought as well as resistance to low temperatures By crossing these lines there have been obtined hybrids having good tolerance to drought, some of them with good resistance to low temperatures in emergence time. The hybrids have been tested in comparative trials. The hybrids has shown good characteristics which determine the seed yield, as well as good resistance to drought and to lodging, also good resistance to diseases. The seed yield released by hybrids has shown a high level.