Electromagnetism is a subject with repect to studying electircity and magnetics. It covers electromagnetic force, the one of four governing force in the natural world (gravitation, electromagnetic, weak and strong nuclear forces). This subject focuses on raising the ability that is applying electromagnetic theory to realistic life or industrial field. Especially, Electromagnetism1 deals with electrostatics mainly. It consists of vector analysis which is the mathematical language of electromagnetism, Coulomb law and electric field, dielectric flux density and Gauss's law and electric potential. Following above, the scientific concept of conductor, dielectric and electric capacity would be instructed.