This is related to the geographical location, climate, geological and geomorphological characteristics and the influence of human activities in this area. Among the climatic factors, temperature, rainfall and humidity are very important; Rock properties and soil properties among geological factors; Geomorphological factors include different environments, such as high, middle and low mountains, hills, Gobi, deserts, plateaus, plains, deltas, wetlands and swamps ... all of which have caused different environmental conditions in different regions.

Areas with beautiful scenery and environment require suitable geographical location, rainfall, temperature and humidity, and good vegetation development. Generally speaking, due to less rainfall, low temperature, bare surface rocks, lack of soil, or human activities, there are few plants in barren hills and mountains. Generally, the slope of the polluted area is large, the vegetation is poor, the soil is exposed, and the rain washes away, forming turbid water rich in sediment. The pollution of Tuling River in many barren hills is closely related to the impact of human activities on the environment.