Abstract: The high frequency and high voltage generator is a most important part of CT. This article mainly introduces the composition and principle of high frequency high voltage generator, The FM and PM methods of the pulse control of high frequency inverter,The choice of the material of magnetic core of the high frequency, The design of coil and the calculation of loss, The consideration of electromagnetic compatibility, The design of the high voltage rectify circuit. To understand the high voltage generator of manufacture 20kHz and 50kHz.