Abstract: The influence of the four different methods of measuring Lg amplitude, and of the selection of different geometrical attenuation coefficient -values ( = 5/6 or 1) on the determined -value of Lg wave anelastic attenuation coefficient are discussed.The value = 0.0034 + 0.001km-1 for the six eastern provinces of China is re-dtermined. The revised magnitude calibration function qE()=5/6lg+0.00147+1.81 of mLg(mxh) is deduced.