In this research we studied the corrosion rate changes of iron samples which are not galvanized in the laborators ( laboratorsies of the faculty of science) and in nature (on the beach of the high-institute sea- research in Lattakia) The Inula extracts were choosen as a plant inhibitor to cover the iron samples and protect it . because this plant is well known in the Coastal area, also it,s very cheap and easy to find and has good anti oxidation properties. The best conditions for (Inula-seawater) extract were : (PH=7 , time =24 hours , concent ration = 10%). The studied iron samples were treated with the ( inula-seawater) extract in the same previous conditions and we studied the corrosion rate changes for those samples and the affectivity of the inhibitor for them. The results were compared in each stage with other samples that were not treated . the treatment and after it were as follows: The velocity of the corrosion in the iron samples (before the treatment with the extract) in 120 days: - in the laboratory tanks was 0.78 mg/cm2 .day, but after the treatment was 0.23 mg/cm2.day -in the drizzle area was 0.80 mg/cm2.day, but after the treatment was 0.47 mg/cm2.day -in the waves area was 0.75 mg/cm2.day , but after the treatment was 0.41 mg/cm2.day - in the depth area was 0.79 mg/cm2.day , but after the treatment was 0.21 mg/cm2.day.