Silicon-organic hybrid (SOH) platform combined with silicon-on-insulator (SOI) waveguides and the functional organic nonlinear materials opens a route to highly-speed ultra-compact electro-optic devices. Recently, bandwidth of frequency responses of modulators based on SOH is up to 100 GHz, and enabled operation is up to 112 Gbit/s with an energy consumption of 640 fJ/bit. Main SOH electro-optic modulators, such as the Mach-Zehnder interferometer (MZI) modulator, in-phase/quadrature-phase (IQ) modulator and mcroring-resonator modulator, are introduced. Meanwhile, the design principle, characteristics and research status of the modulators are illustrated.