The method of open circuit thermally stimulated current (TSC) measured in open circuit to determine the spatial charge centroid location in a nonmetalized polymer film is presented in this paper. By performing open circuit TSC together with the measurement of the surface potential of the sample, we can calculate the location of charge centroid in dielectrics. The charge centroid in charged polyethyleneterephthalate film (50‐&mgr;m thick) measured 1.9±0.3 &mgr;m from the upper surface.