The conception of equivalent mixing volume is successfully introduced in the study of water quality model for deep lake, hence a new and pratical water quality model for deep lakes is established.

To understand the status of the microbiological pollution from the different water body in Jiaxing city by detecting the counts of bacterial, total coliforms, pathogen, fungi and yeasts in water samples collected from riverway water, canal water, lake water and water supply under different circumstance of temperature.

Solar radiation has cooperation with biodegradation of the organic pollutants in the lake water.

Survey of potassium,sodium ions in lake water by atomic absorption spectrometry(AAS) was studied in this paper,negative high voltage,lamp current and other instrument settings were optimized.