A high-voltage insulator is an electrical power device that is usually used in the transmission and distribution system. The insulator is normally attached to the other instrument as a protection in case any breakdown or fault happens. Each high-voltage insulator has its own properties. Meanwhile, a grading ring, one of the components connected to the insulator, to improve the distribution of the electric field on the insulator’s surface. This study, it involves the hydrophobic property of the insulator’s surface since it is a primary issue that influences the electric field distribution. The distribution of the electric field in a high voltage insulation system is important because it can affect the performance, reliability and safety of the insulator. The electric field needs proper management to prevent electrical breakdown, extend the lifespan of insulation materials, and reduce power losses. Consequently, this study is mainly about the effect of the grading ring's design parameters and the presence of water droplets towards the electric field distribution on high-voltage insulators by using FEA software, which is COMSOL Multiphysics, to conduct the analysis that includes evaluating the electric field distribution across the high-voltage insulators. The grading ring's diameter, thickness, distance from the end of the insulator, and the water droplet parameters, which are size and location, are varied to observe how the electric field distribution is affected. The results from the simulation show that increasing the grading ring's diameter and thickness, the maximum electric field (Emax) observed on the insulator surface will increase by 25 %. Besides that, the performance increases by 20% after placing a grading ring along the high-voltage insulator, while higher positions of the grading ring from the end reduce this performance by 15%. Water droplets at curved surfaces showed a higher electric field, and larger droplets concentrated the electric field more. The grading ring with the lowest electric field was chosen based on these findings, and the electric field along the insulator surface was then simulated. A proper grading ring design is essential for even electric field distribution that mitigates localised surface stress and supports optimal steady state power transmission and distribution performance.