Analyses and comparison of the water quality of each monitoring station with national water quality standards were carried out based on the accumulated data formany years from earthquake monitoring net of ground fluid in Gansu Province.Dynamic analysis of some items was involved.The results show that water quality of springs in the region has been comparatively steady for more than 20 years.Water quality of most of springs,except a few,exceeds the national drinking water quality standards.However,this depends on the water source itself rather than pollution from surrounding environment.