TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compositions: In step (1), nitrating agent is nitric acid with molar amount of 0.8-1.5 times, preferably 1.04-1.2 times the amount of p-dichlorobenzene; molar amount of concentrated sulfuric acid is 0.5-5 times, preferably 0.9-0.3 times amount p-dichlorobenzene; and alkali used in washing is 1-50% of hydrogen sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, or potassium bicarbonate aqueous solution either. In step (2), aminating reagent is ammonia, aqueous ammonia; aminating solvent is methanol, ethanol, propanol, isopropanol, xylene, toluene, and/or water, preferably methanol or ethanol; molar amount of aminating reagent is 4-16 times, preferably 6-10 times the amount of 2,4-dichloronitrobenzene; and amount of solvent is 2-5 times, preferably1-3 times the amount of 2,4-dichloronitrobenzene. In step (3), molar amount of thiophenol is 0.9-3 times, preferably 0.98-1.5 times the amount of 2-nitro-5-chloroaniline; amount of solvent is 2-8 times, preferably 2.5-4 times the amount of 2-nitro-5-chloroaniline; amount of base is 1.1-2.5 times, preferably 1.25-1.5 times the amount of 2-nitro-5-chloroaniline; solvent is ethanol, methanol, propanol, isopropanol, n-butanol, and/or water, preferably methanol or ethanol; and base is sodium hydroxide, potassium hydroxide, sodium carbonate, or potassium carbonate, preferably sodium hydroxide or potassium hydroxide. In step (4), amount of solvent is 2-5 times, preferably 2-3 times the amount of 2-nitro-5-phenylthioaniline; amount of reducing agent is 1.2-50 times, preferably 5-30 times the amount of 2-nitro-5-phenylthioaniline; solvent is methanol, ethanol, propanol, isopropanol, and/or n-butanol, preferably methanol or ethanol; reducing agent is hydrogen, hydrazine hydrate, stannous chloride, or sodium borohydride, preferably hydrogen; catalyst is nano-nickel, palladium (Pd ), platinum (Pt), ruthenium (Ru), rhodium (Rh), Raney nickel (Raney Ni), or ferric chloride, preferably Pd, Ru, or Raney Ni; and catalyst carrier is carbon, oxide strokes, or titania. In step (5), reaction solvent is selected from chloroform, dichloromethane, toluene, methanol, ethanol, propanol, isopropanol, and/or n-butanol; cyclization reagent is methyl S-methylisourea (sic), O-methyl isobutyl methyl urea (sic) or methyl cyanamide; and mole amount of cyclizing agent 1-2.5 times the amount of 4-phenylthio-o-phenylenediamine.Preferred Conditions: In step (1), temperature of nitration is 0-20 degrees C, preferably 5-20 degrees C, and nitration reaction time is 1-5 hours. In step (2), reaction temperature is 80-250 degrees C, preferably 120-160 degrees C; and reaction pressure 0.8-10 MPa, preferably 2-4 MPa. In step (4), reaction temperature is 50-120 degrees C, preferably 60-100 degrees C. In step (5), reaction temperature is 60-120 degrees C, and reaction time is 1-24 hours.