Since the marine source is vast, an optimized energy converter design is needed to extract as much marine energy as possible. This paper briefly overviewed the optimization technique of hydrofoil for the ocean current energy development. Optimization was considered an essential solution to solve the hydrodynamics design problem formally and systematically. Optimization methods such as Genetic algorithms, Particle swarm optimization, and Computational fluid dynamic were the widely used techniques in achieving the optimal hydrofoil shape for ocean current energy applications. This paper also overviewed the Artificial Neural Network as an objective function for the optimization algorithm to reduce the optimization process time-consuming. It is crucial to improve the optimization process. Based on the outcome of this review paper, the selection of design variables has a significant impact on the optimization process. Therefore, it is recommended to apply different hydrofoil types and adjust the thickness and camber of the hydrofoil where both are essential geometric parameters. Optimization of hydrofoil's shape is crucial to increase the hydrodynamic performance of the turbine blades. Finally, the optimal design of the current energy converter hopefully will help ensure the continuity of energy harvest from the untouchable ocean and reduce the diversification burden on existing technologies yet can also act as a backbone for driving the economy.