Abstract: Through processing the data of digital seismic records with high precision collected in the Luanxian Region,the Qc values of the medium corresponding to seven different frequencies (f=1.5,3.0,6.0,10.0,15.0,20.0,25.0 Hz) have been obtained by using the coda wave analysis method. It is found that the Qc value versus frequency can be approximated by the relation Qc=afb. We have obtained a= 46,b=0.85 for shorter lapse time and a= 72,b=0.90 for longer. The large values of b show the strong dependence of Qc on frequency. The value of a (for Qc at 1 Hz) is quite small. These results indicate that Luanxian is a region with strong' tectonic motion.