The Dagujia River's water quality was studied between 1998 and 2002, focusing on factors like pollutants and oxygen levels. The research found that the river's water is seriously polluted, with total nitrogen being the main issue. To tackle this problem, suggestions were made, such as reducing pollutants from various sources, improving wastewater treatment in cities, and controlling new sources of pollution. These measures aim to protect the river's water quality and plan for controlling pollution effectively.