This thesis summarizes my PhD work on intense Terahertz (THz) light-quantum quench and control of superconductivity. BCS superconductor Nb3Sn and iron based superconductor Ba(Fe1-xCox)2As2 are studied by intense THz/optical pump/-weak THz probe ultrafast spectroscopy. I design and develop the experiment setup that reaches the strongest THz pump reported so far in similar tabletop congurations. Single cycle THz pulses up to MV/cm peak E eld open up a new regime to explore the quantum dynamics and emergent phase in condensed matter system, including superconducting (SC) condensate, topological Dirac fermions, exciton phase transition, quantum coherence in perovskite solar cell and 2D materials.