Traditional optical decoys have complex compositions and high loading requirements. In this study, optical decoys with simple microstructures with higher reflection performance were designed. First, the TracePro optical simulation software was used to simulate the reflectivity of the glass bead structure, truncated angular cone structure, and cubic angular cone structure, and the structure that best meets the requirements of high reflectivity of optical bait was selected. Then, the microstructure size of the optical decoy were determined by the reflection simulation of the microstructure of the unit with different sizes. Finally, the effect of incident angle deflection in reflectivity was simulated to determine whether the reflector meets the requirements of the optical bait. Results show that the cubic cone reflection structure is more suitable for the design of optical decoys.