Accurate depths of aftershocks are a help to understand deep tectonic structure and stress field beneath the Longmenshan fault. Depths of most aftershocks of the Ms8.0 Wenchuan earthquake were reported in upper crust （〈25km）. Recently, some observations were regarded as evidences to two deep aftershocks （ 〉 30km）. We analyzed broadband seismogram of these events based on P wave polarity and sPL waveform, but they both support the depths less than 20km. To confirm the error source, we investigated residuals of other events with high location precision and considered dominant errors arising from inaccuracy locations of some temporal seismic stations.[著者文摘]