Abstract: It is can be bring optical-transition radiation(OTR) when the charged partical constant speed passed through interface of two dissimilarity intermedium. The radiation showed polarization behavior while the charged partical arrive at incidence plane, it is can be confirm energy of incidence partical corresponding OTR angle distribution patterns. The OTR angle distribution had polarization behavior at secondarily foil’s surface due to interference happened while electron beam entered the double foil system. It is can be measure parameter of pulse electron beam by used these phenomenon, The parameter includes electron beam envelope radius, landscape orientation distribution of electron beam current density, and electron beam energy, electron beam landscape orientation divergence angle distribution. using this theory to measure parameter of pulse electron beam basing on a series of Dragon LIAs and obtains valid time-resolved results. This measurement ability has improved greatly the debugging efficiency of a series of Dragon LIAs.