TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The alkali solution is lithium hydroxide, sodium hydroxide, potassium hydroxide, cesium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate and amine NHR1R2R3 water solution. The strong alkali is sodium carbonate, potassium carbon or cesium carbonate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The high boiling point non-protonic polar solvent is dimethyl sulfoxide, N,N-dimethyl acetamide, N,N-dimethylformamide or N-methyl pyrrolidone.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): The compound (I) is prepared by mixing phosphonic acid-containing monomer and phenyl disulfide, adding strong alkali, dividing water, heating under high boiling point non-protonic polar solvent at 185 degrees C for 12 hours to prepare module containing phosphonic acid having molecular amount of 2000-20000, mixing sulfonic acid-containing diphenol monomer and dihalide monomer, mixing, adding strong alkali, dividing water, heating under high boiling point non-protonic polar solvent to 110 degrees C for 12 hours to prepare module containing sulfonic acid having molecular weight of 2000-20000, mixing module containing phosphonic acid and module containing sulfonic acid at ratio of 1:1, and reacting under high boiling point non-protonic polar solvent at 110 degrees C for 12 hours. Preferred Method: The method further comprises pouring reaction liquid into deionized water to obtain fiber shape polymer, soaking at 60-80 degrees C for 5-10 hours, repeating for 3-5 times, filtering, soaking into 0.5 M sulfuric acid water solution at 60-80 degrees C for 5-10 hours, repeating for 2-3 times, soaking into deionized water at 60-80 degrees C for soak 5-10 hours, repeating for 3-5 times, filtering, drying, vacuum drying, dissolving into 20% N,N-dimethyl acetamide, pouring into 0.5 M alkali solution, soaking at room temperature for overnight to obtain solid, washing with deionized water, and vacuum drying.