Abstract: In order to evaluate the quality of pond of coastal saline-alkaline land by principal component analysis（PCA）, 20 indicators of water and sediment were detected. The results showed that the cultural water quality was the worst at the early stage, but it turned better at the middle, and it got worse at the last stages of the breeding.

Key words: pond of coastal saline-alkaline land, physical-chemical factors, sediment, principal component analysis （PCA）