An extensional M_W6.0 earthquake struck the Central Italy on August 24,2016. Two months later,three other large shocks-M_W5.5,M_W5.9 and M_W6.5 occurred successively near the focal region of the M_W6.0 earthquake. It is important to figure out the trigger mechanism between these large earthquakes. However, traditional method to detect events usually miss a vast number of aftershocks, which contain the insight of aftershocks distribution and migration. We adopt the matched-filter method to perform the detection of aftershocks through continuous waveforms 80 days after the M_W6.0 mainshock,and the total number of detection events is ten times those listed in the template catalog. Moreover,the magnitude of completeness of the new catalog consisting of both detection and template events is lower than before. Our analysis on new catalog indicates the differences among the evolutions of aftershocks following M_W6.0,M_W5.9 and M_W6.5. M_W6.0 was followed by an aftershock sequence expanding towards both sides along the fault strike,but there were heterogeneous postseismic migrations of M_W5.5 and M_W6.5. Here,we find the early aftershock fronts expand with logarithm time since M_W6.0 and M_W5.5,indicating that the postseismic migration is driven by the aseismic slip.