Abstract: The main idea of reassignment method in time-frequency analysis is presented and some expressions used to compute the accurate location of the local energy gravity center are given; then two numerical experiments are presented to show how these reassignment methods work individually as used to process single-trace seismic data. Based on the experiments, some conclusions are drawn that the reassignment methods can not only effectively reduce cross-terms, but also lead to a good time-frequency concentration. Compared with others, the reassignment spectrogram has the best potential for ideal time-frequency concentration, especially when the dominant frequencies are required to be underlined. The reassignment smoothing pseudo Wigner-Ville distribution can also achieve perfect effects though it is a little worse than the former one. The pseudo Margenau-Hill distribution is the worst of the three, since it fails to relocate the dispersive energy to the calculated center. A pretty precise instantaneous frequency section can be produced when the reassignment method is applied to deal with seismic signals.