Based on the Sato model, adopting digital wave datas of 121 earthquake above ML2.0 from Jan. 2008 to Dec. 2009, which were recorded by Ningxia earthquake nets, the average Q value of seismic coda in relative regions is calculated, and the relationship between Q value and frequency is polyfited. The whole region′s result is Q(f)=(44.81±15.87)·f 0.9491±0.0805. Compared with other regions, the Q value of seismic coda in Ningxia and adjacent regions is relatively lower, but the dependence on frequency is higher. Comparison of the polyfited results shows that Q value′s distribution reflects the related region′s tectonic activities and seismic activity.