Affected by the influence of skin effect, the current density distribution on the conductor crosssection is completely different when there is high frequency current and direct current flowing through the conductor respectively. In this article, the theoretical basis of skin effect and the calculation formula of conductor resistance were introduced. With the help of Ansoft Maxwell electromagnetic field simulation software, a circular wire and a rectangular wire were modeled and simulated, and the figures of skin effect under different current frequency were given. It is also proved that with the increase of current frequency, the skin depth will be smaller and the resistance loss of the wire will be greater by comparing the current density distribution on the conductor crosssection under different frequency.