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The results of hydrodynamic model experiment of otter board will have different degree of test deviation due to various factors such as processing method and structure simplification. In order to explore the influence mechanism of the processing materials of the otter board model on the hydrodynamic experiment, the double-slit rectangular curved otter board was selected as the research object. Based on the fluid-structure coupling algorithm combined with the flume tank model experiment, the influence on the hydrodynamic experiment and its structural response difference between the three 3D printing materials otter board and the traditional steel materials otter board was analyzed. The results show that there are significant differences in structural response and hydrodynamic performance between the traditional metal (Steel) and non-metal (ABS) models. With the increase of the angle of attack and the flow rate, the maximum deformation of the otter board increases, and the difference of lift coefficient and drag coefficient also increases. Due to the large elastic modulus and strong rigidity of PVC material, the structural response is close to that of metal material, so it has little influence on the results of hydrodynamic experiment. Based on the above results, PVC can be used as the 3D printing material to ensure the accuracy of the model and reduce the influence of the model material on the accuracy of the hydrodynamic experiment results. [ABSTRACT FROM AUTHOR]