|This course is aimed to the high voltage engineering and insulation co-ordinations. The fundamental of high voltage theory is first erected for realizing the electromagnetic characteristics of high voltage. The behaviors of transient state and steady state of power system\'s equipments and related apparatuses energized by high voltage will be analyzed. The root causes that produce abnormal high voltage will be surveyed. Furthermore, some important parameters and the methods are derived for the planning, design, construction, operation, and test of high voltage engineering. In addition, the characteristics of high voltage insulation materials are investigated , in which, some important parameters will be defined for assessing the performances of insulation material. Finally, the issue of insulation co-ordinations are discussed in detail for application on the planning and design of high voltage engineering.