This study was designed to evaluate the effect of adding the essential oils (EOs) extracted from marjoram, peppermint, anise and fennel compared with synthetic antioxidants (BHT and BHA) to sunflower oil (SFO) on the oxidative stability during heat treatments (180±5°C for 18 h). Results showed that the aromatic plants contained of phenolic substances (26.52 - 45.26 mg) can be used as natural antioxidants. Using of antioxidants (EOs and BHT, BHA) with SFO increased their oxidative stability compared with untreated SFO sample (control).Data demonstrated that the values of acid, peroxide, thiobarbituric acid (TBA value), conjugated diene and triene increased to the highest rates in SFO control (without antioxidant) compared to SFO + antioxidant, while the iodine value was significantly decreased in SFO control compared with SFO + antioxidant during heating. The data also showed that the thermal stability (Rancimat value) of SFO was enhanced by adding EOs. Generally the adding of EOs as natural antioxidants can definitely create a significant impact in the market as there is no adverse health effect on the usage of EOs as a natural compounds compare with synthetic antioxidant in food.