The basic characteristics of Tangshan earthquake sequences have been analysed in this paper according to the seismic data by the end of 1979.The authors suggest that the Tangshan earthquake sequences are characte-rized by many macroquakes,slow attenuation of energy,great fluctuation,large size extension and so on in the general and it is of obvious regional features showing the different seismicities in various areas.From this,the authors have discussed the type of the Tangshan earthquake sequences.The authors emphasise that the magnitudes of the three strongest earthquakes (M=7.8 in Tangshan、M=7.1 in Luanxian and M=6.9 in Ninghe) were almost similar to each other but different in seismotectonics and the existence of three sub-sequences headed by the three earthquakes.It is reasonable to name it as a sequence of multi-main shock type.