This paper analyzes the series-series (SS), series-parallel (SP) and four typical hybrid-series-parallel topologies (S-LCL, LCL-S, LCL-P and LCL-LCL) in resonant wireless power transfer. Functions of their primary and secondary resonances are explored and comparisons are made between their load characteristics as well as open-circuit and short-circuit performances. This work is helpful for the selection of resonant types in industrial application to satisfy different load requirements.