Increasing the switching frequency is critical to increase efficiency, power density and dynamic performance. Soft Switching Technology is an effective way to increase the switching frequency, which have been successfully applied in switching power supplies etc. However, applications of soft switching technique to IGBT-dominated three-phase converters/inverters are not common up to now. Wide-band-gap (WBG) device may help pushing the applications of soft-switching to three-phase systems. Firstly this tutorial will introduce impact of WBD device on the soft-switching three-phase conversion technologies after explaining and the fundamental of soft-switching three-phase inverters/converters. A generic modulation method of Zero-Voltage-Switching (ZVS) three-phase power conversion are introduced, which is suitable to both 3-phase 3-wire and 4-wire power converters and inverters. Then analysis and design of ZVS three-phase inverters/converter is investigated with respect to resonant parameters, ZVS condition, stress of power devices etc. Afterwards the soft-switching concept are extended to other topologies such as Back to Back (BTB) converter, PV string inverter, battery systems etc. Finally Prototype of 20kW ZVS SiC inverter, and 10kW ZVS SiC BTB converter will be introduced. The intended audiences are researchers and engineers interested in either an entry-level of introduction or an in-depth understanding of progress of soft switching three-phase power conversion.