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The aim of this study was to investigate the functional yogurt containing olive oil (0%, 3%, and 6%) and celery seed powder (0%, 1.5%, and 3%) and The effect of each experimental treatment 1, 7, and 14 days after production on physicochemical properties. According to the obtained results, the formulation of functional yogurt using different concentrations of olive oil and celery seed powder caused a significant difference (P ˂ 0.05) in physicochemical properties affected by the amount of olive oil and celery seed powder over storage time. So that storage time was directly related to acidity and watering and had an inverse effect on pH. While the amount of celery seed powder was directly related to lean dry matter, protein and hydration. Also, the percentage of olive oil with fat had a direct effect and had an adverse effect on hydration and samples containing olive oil had a higher acidity index than the control sample. Regarding the analysis of fatty acids, by adding olive herbal oil to the control sample, the amount of short and medium chain fatty acids such as 14:­0, 16:­0, 12:­0, 10:­0, 8:­0, 6:­0 showed a significant decrease. But the amounts of fatty acids 18:­1 and 18:­2 increased significantly. The results of this study showed that by using different concentrations of olive oil and celery seed powder in the formulation of functional yogurt, physicochemical properties with different properties can be created, each of which can be considered according to the definition of the desired product properties.

Keywords: Yoghurt, Celery, Acidity, Synersis, Protein, Fat

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