What functions does polyacrylamide play in all walks of life? In the aspect of oil exploitation, polyacrylamide has the functions of thickening, flocculating and regulating fluid denaturation. It can be used as thickener, stabilizer and settling flocculant of drilling mud. Adding polyacrylamide into drilling mud can increase the consistency of mud, improve the suspension force, make mud disperse evenly, control water loss, increase stability, reduce friction and improve cementing speed. Adding polyacrylamide in tertiary oil recovery can increase oil displacement capacity, avoid oil layer breakdown and improve oil recovery; polyacrylamide can be used as fracturing fluid additive to increase viscosity, improve suspended sand capacity, reduce filtration and mold resistance; it can also be used as water oil ratio control agent, retarder and temporary plugging agent. In water treatment, polyacrylamide can be used for the treatment of urban sewage, domestic sewage, industrial wastewater, and solid-liquid separation of various groundwater and industrial suspension. In the textile industry, polyacrylamide, as a colorant and finishing agent for fabric post-treatment, can form a protective layer with softness, wrinkle resistance and mildew resistance; its strong hygroscopicity can reduce the breakage rate of spinning yarn. In the paper industry, polyacrylamide can be used as dispersant to improve the uniformity of paper; as reinforcing agent, it can effectively improve the strength of paper; as retention aid, water filtering agent and settling agent, it can improve the retention rate of filler and fine fiber, accelerate the dehydration speed, settle sewage and reduce pollution. In electrolytic metallurgy, adding polyacrylamide can improve the quality of metal deposition on cathode and increase current efficiency. In mining and coal washing, using polyacrylamide as flocculant can promote solid settlement and make water clear. At the same time, a large number of useful solid particles can be recovered to avoid environmental pollution. When used as printing and dyeing auxiliaries, it can make the products have strong adhesion fastness and high brightness. In sugar industry, polyacrylamide can accelerate the sinking of fine particles in sugarcane juice, promote the filtration performance and improve the clarity of filtrate. In the aquaculture industry, polyacrylamide can improve the water quality, increase the transparency of water, and improve the photosynthesis of water. In addition, polyacrylamide can also be used as chemical grouting for water shutoff and sand fixation in tunnels, dams and other projects, as preservative for underwater and underground buildings, as soil conditioner, fiber modifier, binder, photosensitive resin crosslinker, etc.