Abstract:In order to predominate comprehensively the abidance situation of water quality indexes of 12 representative inspection stations of main river in Sichuan Province

and to study the scheduling trend characteristic of water qualities

the article analyzed the pollution characteristic and scheduling trend characteristic. It is first time to use the runoff curve takes a period of time to study the continuance circs of each chemical index. By analyzing the water chemical indexes of each inspection station in Sichuan Province

it show that water quality characteristic analysis reflect the water quality of each inspection station

and water quality model of the runoff curve takes a period of time can reflect the river pollution continuance status preferably and intuitionisticly. Key words: water chemical element; pollution analysis; character analysis; scheduling trend analysis; the runoff curve model takes a period of time