Abstarct: The aim of this study was to obtain a stable Pickering emulsion pomegranate seed oil (PSO) using chitosan-capric acid nanogel and investigate the effect of encapsulation Zataria multiflora essentil oil (ZEO) on the oxidative stability of PSO. The results of the gas chromatography test showed that about 54% of the PSO is composed of punicic acid, which was 18-carbon fatty acid with 3 unsaturated bonds. In the following, capric acid was added to chitosan chains in different percentages to improve its emulsifier properties. The results of the FTIR spectrum confirmed the formation of the bond between chitosan and capric acid. Also, the results of scanning electron microscopy (SEM) showed that the formation of nanoparticles was improved by increasing the percentage The capric acid to chitosan. Then, the effect of different percentages of capric acid to chitosan, different pH and oil content on the stability of pomegranate seed oil Pickering emulsion for one week was investigated. After storage of the samples at ambient temperature, the stability of the emulsions was evaluated using microscopic images and particle size calculation with image j software. The results showed that the most stable emulsion was in pH=8, the nanogel with 50% capric acid and the 100 μl oil content. After determining the most suitable conditions of the pickering emulsion, The oxidative stability in different conditions such as the absence of essential oil and also the pickering emulsion with various amounts of 200 and 1000 μl/ liter of encapsulated ZEO in PSO and nanogel with an emulsion stabilized by Tween 80 were evaluated by peroxide and TBA values during 22 days at 45 °C. The results showed that the emulsion produced by the nanogel have a lower oxidative stability than emulsion containing Tween 80. Also, the results showed that encapsulated ZEO in the nanogel had more oxidative stability than encapsulating that in the PSO.