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This study relates to the simultaneous reduction of NOx and soot exhausted from Direct Injection Diesel Engine. With use of the surface treated carbon fiber, NOx is significantly reduced through the adsorption and chemical conversion into N2 and CO2. With use of stainless steel nets connected with the cathode and electro conductive material composed of Cu coated cloth, carbon fiber and stainless steel net connected with anode of the car battery, soot is collected electrically and is easily removal and combustible into CO2. The test result operated with 500 ml D.I. Diesel Engine shows excellent performance of NOx and Soot at more than 50% reduction with the long recycle life of the used material.