Drinking water grade PAM is mainly be used in raw water treatment, sugar making, fermentation, etc. PAM can be added in raw water for the purpose of settling and flocculating, which can effectively reduce the additive quantity of poly-aluminum, thus avoiding producing too much sludge. In sugar making industry, PAM is efficient in the flocculating and precipitation of bagasse from sugar solution. PAM can be used in the recycling of solid content rom diluted thin stillage water separated from alcohol. In the fermentation process of rhizomorp, it is advisable to use PAM as a flocculant to realize remarkably efficiency of flocculation in the fermentation liquid and improve the liquid-solid separation performance.