Polyamide fiber has good alkali resistance, but poor acid resistance. Under normal room temperature conditioning, it can withstand 7% hydrochloric acid, 20% sulfuric acid, 10% nitric acid, and 50% caustic soda immersion, and the result is not corroded. Therefore, polyamide fiber is suitable for anti-corrosion work clothes. In addition, it can be used as fishing nets, which are not afraid of seawater erosion. The service life of nylon fishing nets is 3 to 4 times longer than that of general fishing nets.