Wang, D. JACoW Publishing Geneva, Switzerland Dielectric wakefield structure (DWS) find applications in many fields such as radiation source, wakefield acceleration, electron beam manipulations. Interaction of electron beam with dielectric wakefield structure is one of the hot topic. We have performed series of experiments on beam interaction with DWS at the TTX beamline, including experiment on the THz radiation, selectively excitation of THz by bunch train, and collinear wakefield acceleration with two beam interferometry method. This talk will give the details on the experimental results.