Scope for of research publications on ocean current energy has increased, resulting in high innovation from ocean energy technology and available models for numerical equations in article publications. Reviews for mapping studies on the development of technology and numerical equations are still rarely carried out. This review refers to articles that use equipment used at sea and are based only on ocean currents for research. From a variety of results of the investigation, it can be expected to be used as material for further studies to find research materials that can be discussed collectively or need to be handled further. The objective of present review study is scanning condition of technology used for analysis and find out the types of numerical equations that are often used in papers in recent years. The result is that various areas of innovation have been investigated in current energy conversion technologies that increase performance and durability and reduce the impact on the environment and have summarised alternative numerical analysis commonly used for current energy conversion technologies.