The invention discloses a manufacture method for PPTA that contains 2,4-2(4-amino phenyl)-2, 3dinitrogen phenodiazine-1-detone. It includes the following steps: adding solvent into polymerization reactor, whisking, adding alkali halide, adding 2,4-2(4-amino phenyl)-2, 3dinitrogen phenodiazine-1-detone and p-phenylene diamine; adding paraphthaloyl chloride that has the thickness of 0.3-0.4 mol/l, whisking, keeping reacting at -10-80 degree centigrade for 30-120 minutes; neutralizing by Ca(OH)2 to gain concentrated PPTA solution. The invention has simple technology, low cost, is easy to purity. It could be used in navigation, high capability compounding material, high temperature resistant film and corresponding fabric. |