Abstract: The spatial gradient method was used in estimating the buried depth of high conductivity layer beneath the region of south-east China. Quiet daily magnetic variations recorded at four observatories, Wuhan, Zo-Se (Sheshan), Guangzhou and Lun-ping, were analysed in this study. The results indicate that beneath this region the buried depth of high conductivity layer in the mantle is 315 km, and its resistivity 9 m; the reliability of these data may be limited by the small number of observation points available. However, the depth of 315 km is basically consistent with that obtained from global analyses (see the article of Rikitake1 or Yukutake2).