Abstract: CEO-SBA15 complex was prepared in the present study, exploiting mesoporous material SBA15 and cinnamon essential oil (CEO) as raw materials. The conditions of optimal process of CEO-SBA15 complex were obtained by single factor experiment, investigating the influence of different conditions on the loading capacity and yield of CEO-SBA15. The structure and properties of CEO-SBA15 complex were characterized by scanning electron microscopy, Fourier infrared spectroscopy, X-ray photoelectron spectroscopy and the release behavior of CEO-SBA15. The effect of CEO-SBA15 on preservation of Pneumatophorus japonicus at 4 ℃ was also investigated. Results showed that the optimum preparation conditions of CEO-SBA15 complex were as follows: mass ratio of SBA15 to cinnamon essential oil 1:20, ultrasonic time 20 min, adsorption time 24 h. Under these conditions, the essential oil loading capacity of CEO-SBA15 complex was 66.22%±0.58%, and the yield was 77.65%±1.62%. SEM investigation showed that CEO-SBA15 was fibrous in shape. FTIR and XPS showed that cinnamon essential oil was loaded into the surface and interior of SBA15 by physical adsorption. The sustained release behavior analysis of CEO-SBA15 showed that the long-term release effect of cinnamon essential oil could be achieved. Moreover, CEO-SBA15 compound could effectively reduce the contents of volatile basic nitrogen, trimethylamine and thiobarbituric acid during the storage period, and could effectively delay the increasing rate pH and the deterioration of color and odor of green fillet, which indicated that CEO-SBA15 had a good preservative effect on green fillet. The present study provided a new idea for the application of CEO-SBA15 compound as the agent of food deodorizer and preservative.