In this study, dyeing wastewater sludge from wastewater treatment equipments in a large scale dyeing industrial complex, was efficiently dried using cogeneration residual heat. We were study of factors such as sludge thickness and retention time in drying process, that was considered characteristic of residual heat for understanding of drying condition and efficiency. Generated residual heat in cogeneration was 150℃ degree, that was very low temperature than existing drying facility at 700℃ degree. However, effluent gases from cogeneration had generated great airflow compare with temperature. Therefore, in case of conversing calorific power was enough value for drying sludges. In case of dyeing wastewater sludges were form of cake that, water contents was more than 70% degree. The more sludge was thick, the more reducing of drying efficiency, and the more retention time was long time, the more increasing of drying efficiency. However, sludge thickness were more than 20mm, drying efficiency were reduced rapidly. Go round, scale of 5ton/day sludge drying pilot plant was manufactured, dosage of sludge process was used extruding nozzle for increasing of drying efficiency. In extruding nozzle, dying wastewater sludge was broken such as form of slice chip for increasing of drying efficiency with extending contact surface on thermal wind drying process. Drying process was installed thermal wind circulated pan on the inside of drying chamber for increasing of drying efficiency. Result of operation pilot plant, water contents of sludge was more reducing 10% to 70% at 52min of retention time.