Structural vibration control is a new and positive strategy of structure design. The semi-active control has characteristics of low applied energy, simple device, good stability and damp effect similar to active vibration control. In recent years, semi-active control has received widespread attentions both at home and abroad, and it has achieved great research progress. However, there are still some significant deficiencies. Firstly reviews the theoretical research of semi-active control devices and the devices’development, then analyzes their characteristics, finally prospects the technology developing trend.